Abstract:
An internal combustion engine, and an optional integrated electrical generator, both enclosed in a single waterproof and dustproof case. The engine has at least one cylinder and piston which extends radially from an axis of rotation about which a cam track assembly rotates. The engine block, including at least one cylinder, remains stationary.

Description:
[0001]    This invention relates to an engine and generator, and more particularly to improvements in mechanical internal combustion engines, and electrical generator combinations for producing electrical energy. The invention also relates to a method of utilizing the engine and generator to produce mechanical and electrical power. 
       BACKGROUND OF THE INVENTION 
       [0002]    In these times of ever increasing global demands for all liquid and gaseous fuels, increased concern regarding the use and supply of fossil fuels, and the constantly growing demand for electrical energy, it is clear that there is a need for a better, cleaner, more efficient method of using those fuels and producing electrical energy for both stationary as well as for portable energy needs. Although there is currently a great emphasis on the development of cleaner, environmentally friendly systems for producing electrical energy through methods such as solar, wind and wave, they are not always practical especially in portable applications. These cleaner technologies often lack the dependability necessary in electrical supply applications. It is not always sunny or windy, and the bodies of water large enough to produce usable wave power are not always wavy. There will always be a need for dependable and efficient, turn key, methods of outputting mechanical power and/or producing the electrical energy that we need to survive and grow. A goal is to develop the best, most cost effective method possible of utilizing fossil or synthetic fuels while producing electrical energy efficiently. 
         [0003]    The “Stationary Block Rotary Engine/Generator” of the present invention represents a great improvement in the ability to convert energy from fuel into either mechanical output power or clean electrical energy. The present invention is a markedly smaller, lighter, and more power dense power output system. The present invention is also more energy efficient, environmentally friendly, durable and dependable than conventional engine and generator combinations, and it is far more affordable to produce and operate than conventional engine driven generators. This technology is particularly advantageous in larger applications as the benefits of size, weight, power density and efficiency increase with larger outputs. More importantly, this technology offers an immediate and positive step forward in the goal to conserve the world&#39;s energy resources. 
         [0004]    The present invention seeks to meet the aforenoted demands and needs for an environmentally friendly, conservation minded, energy efficient mechanical power output and electric generating device that is smaller, lighter, more power dense, more durable, dependable and more affordable by providing a unique rotary engine design combined with an optional integrated generator, enclosed in a single waterproof, and dustproof case with the purpose of driving magnetic and/or electromagnetic pole pieces rotationally past an integrated stationary coil for the production of electrical energy. 
       BRIEF SUMMARY OF THE INVENTION 
       [0005]    This invention is directed to an internal combustion engine and an improved stationary or portable power source employing an internal combustion engine and generator combination, and more specifically includes a novel stationary block, rotary engine which optionally integrates an electrical generator with a piston actuated rotary cam-track assembly capable of optimizing the combustion process and converting combustion energy into mechanical output power or into electrical energy. The engine&#39;s outer case and block containing the combustion cylinders and pistons remain rotationally stationary while the endless twin-cam-tracks optionally supporting magnets and/or electro magnets are made to rotate within a stationary coil disposed internally to the stationary outer case halves. The engine combustion cylinders and pistons preferably operate generally similar to a two-cycle engine but without the negative environmental impacts associated with two-cycle engines. The unlimited configurations and refinements offered by this engine design during all facets of the combustion process, combined with the advantages of an application requiring a very limited operating speed range, provides the framework by which an extremely efficient use of any liquid or gaseous fuel can be realized while producing unprecedented advantages in size, weight and power density for power generation equipment. The integration of both the stationary block rotary engine, having a greatly reduced parts count and far greater power density than conventional engines, with the electric generator, which requires only the addition of rotating magnets that rotate with the rotating cam-track assembly and a stationary coil that may be attached to or be a part of the outer case halves, also offers substantial improvements in manufacturing as well as the operating cost per kilowatt. 
         [0006]    It is the intention that at least one embodiment of this invention to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and rotating cam-track assembly requiring no main shaft or sleeve bearings which would require seals that would adversely affect durability and cost. 
         [0007]    It is the intention that at least one embodiment of this invention to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and rotating cam-track assembly requiring no main shaft or sleeve bearings which would require rotary valves and additional rotary seals further adversely affecting durability and cost. 
         [0008]    It is further the intention that at least one embodiment of this invention to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and rotating cam-track assembly requiring no main shaft or sleeve bearings which would require rotary valves and additional rotary seals which could fail adversely affecting air quality. 
         [0009]    It is still another intention of at least one embodiment of this invention to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and rotating cam-track assembly which will provide improved engine cooling means. 
         [0010]    Still another intention of at least one embodiment of this invention is to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and rotating cam-track assembly which will provide reduced internal friction losses. 
         [0011]    Still another intention of at least one embodiment of this invention is to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and rotating cam-track assembly which will provide reduced exhaust pressure to enhance cylinder cooling and cleaning. 
         [0012]    Another intention of at least one embodiment of this invention is to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly which is located on and by the stationary block and within the stationary outer case halves of the assembly. 
         [0013]    Yet another intention of at least one embodiment of this invention is to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly equipped with improved low friction bearings to increase output power, conserve energy and increase durability. 
         [0014]    Still another intention of at least one embodiment of this invention is to provide an enclosed rotary internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly capable of supporting magnets and/or electro magnets for the production of electrical energy. 
         [0015]    A further intention of at least one embodiment of this invention is to provide a rotating cam-track assembly capable of supporting any number of magnets and/or electro magnets for the production of electrical energy regardless of the number of cylinders employed in the stationary block. 
         [0016]    It is another intention of at least one embodiment of this invention to provide an engine design that would allow the use of Plug-In-Piston technology to improve combustion efficiency and output power. 
         [0017]    It is an intention of at least one embodiment of this invention to provide a unitary internal combustion engine generator with a stationary engine block and a rotating cam-track assembly having vastly improved flexibility of design in order to optimize all facets of the combustion process and to maximize the subsequent internal conversion of combustion energy directly into electrical energy. 
         [0018]    It is another intention of at least one embodiment of this invention to provide an internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly having a prolonged dwell at the top of the piston stroke whereby the ignited air/fuel mixture in the cylinder is allowed to combust more completely while the piston is substantially stationary relative to its position in its related cylinder. 
         [0019]    Yet another intention of at least one embodiment of this invention is to provide an internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly having a prolonged dwell at the top of the piston stroke whereby the ignited air/fuel mixture in the cylinder is allowed to expand more completely to provide a means to produce much greater cylinder pressure while the piston is substantially stationary relative to its position in its related cylinder. 
         [0020]    It is yet another intention of at least one embodiment of this invention to provide an internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly requiring no form of head gasket or main bearing cap which would limit the engines ability to withstand extremely high cylinder pressures. 
         [0021]    It is still another intention of at least one embodiment of this invention to provide an internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly having an infinitely variable cam-track configuration such that an optimized transformation of the linear motion of the piston is converted into the an optimized rotary motion of the combined cam-track and generator armature assembly. 
         [0022]    Still another intention of at least one embodiment of this invention is to provide an internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly having a prolonged dwell at the bottom of the piston stroke whereby exhaust of spent gases is accomplished while the piston is substantially stationary relative to its position in its cylinder eliminating internal energy losses related to the forced expulsion of exhaust gases by the forced movement of the piston. 
         [0023]    It is still another intention of at least one embodiment of this invention to provide an internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly in which there is a prolonged dwell at the bottom of the piston stroke such that each piston carrying cylinder may be cleaned or purged of spent gases while the piston is generally stationary relative to its position in its cylinder. 
         [0024]    A further intention of at least one embodiment of this invention is to provide a prolonged dwell at the bottom of the piston stroke in a multi-cylinder internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly whereby each cylinder is cleaned, purged and air cooled internally while exhaust valves are held open in a prolonged substantially stationary position. 
         [0025]    Still another intention of at least one embodiment of this invention is to provide an environmentally friendly two-cycle styled, multiple cylinder and piston, internal combustion engine/generator with a stationary engine block and a rotating cam-track assembly in which each piston has a prolonged dwell period, such that a related cylinder exhaust valve is in a complete state of closure prior to the introduction of fuel into the cylinder so as to eliminate pre-combustion pollutants from escaping into the atmosphere. 
         [0026]    A further intention of at least one embodiment of this invention to provide an environmentally friendly, clean two-cycle styled rotary engine/generator embodying an advanced combination rotary cam-track and generator armature assembly capable of operating as a two-cycle engine without the addition of lubricating oils or compounds within the fuel of choice, so as to further reduce exhaust pollutants. 
         [0027]    It is a further intention of at least one embodiment of this invention to provide an environmentally friendly, clean two-cycle styled rotary engine/generator embodying an advanced combination rotary cam-track and generator armature assembly capable of dictating multiple firings of each cylinder in the course of a single complete rotation of the cam-track assembly. 
         [0028]    It is another intention of at least one embodiment of this invention to provide an advanced rotary internal combustion engine, with a stationary engine block and a rotating cam-track assembly, designed for use in a unitary engine/generator embodying the features of the aforestated objects. 
         [0029]    It is still another intention of at least one embodiment of this invention to provide a means for generating electrical energy utilizing a stationary block internal combustion engine to cause rotation of a cam-track assembly which includes magnets and/or electro magnets to form a complete rotating generator armature assembly. 
         [0030]    An overall intention of at least one embodiment of this invention is to provide a compact, lightweight, means of providing a highly efficient source of stationary and/or portable electrical power, and which is dependable in use, economical to manufacture and friendly to the environment. 
         [0031]    It is an intention of at least one embodiment of the invention to provide an engine comprising: a stationary engine block having at least one cylinder; a piston moveable coaxially within each of said at least one cylinder; at least one cam follower associated with each piston; at least one rotatable cam plate; an endless cam track formed within the cam plate, the at least one cam follower being operationally engaged with said cam track; and a stationary housing encasing said engine block and said at least one rotatable cam plate; wherein combustion actuation of each piston serves to rotatably drive said at least one cam plate. 
         [0032]    It is also an intention of at least one embodiment of the invention to provide an engine including a spark plug which is attached to and moves in unison with each piston; a spark plug electrode disposed within each piston, the spark plug electrode extending between said spark plug and a piston wrist pin electrode; and an electrical energy transmitter which aligns with the wrist pin at at least one point during the travel of the piston within the cylinder, to transmit electrical energy to said wrist pin electrode. 
         [0033]    It is further the intention of at least one embodiment of the invention to provide an engine/generator including: a stationary electric coil, and at least one magnetic mass mounted for movement with the at least one cam plate to generate electrical energy in response to orbital movement of said magnetic mass past said electric coil. 
         [0034]    It is a still further intention of at least one embodiment of the invention to provide a method of generating power comprising the steps of: providing an engine comprising: a stationary engine block having at least one cylinder; a piston moveable coaxially within each of said at least one cylinder; at least one cam follower associated with each piston; at least one rotatable cam plate; an endless cam track formed within the cam plate, the at least one cam follower being operationally engaged with said cam track; and a stationary housing encasing said engine block and said at least one rotatable cam plate; and rotatably driving said at least one cam plate by combustion actuation of each piston. 
         [0035]    Having described this invention, the above and further objects, features and advantages thereof will become readily apparent to those skilled in the art from the following detailed description of a preferred embodiment illustrated in the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
         [0036]      FIG. 1  is an exploded side sectional elevational view of the stationary block engine/generator showing the major parts of the engine/generator referenced in the hereinafter appearing description of this invention; 
           [0037]      FIG. 1A  is an enlarged top sectional view of the piston assembly taken to show the top elevation of the assembly generally through the center line of the component parts and with the addition of the top cam bearing; 
           [0038]      FIG. 1B  is an enlarged side sectional view of the piston assembly taken generally through the center line of the assembled component parts; 
           [0039]      FIG. 2  is an exploded side sectional elevational view and the respective top or bottom elevational views of the parts associated with the rotating cam-track/armature assembly; 
           [0040]      FIG. 3  is a top elevational view of the assembled rotating cam-track/armature parts illustrated in  FIG. 2  with the cam-track surfaces shown highlighted as solid lines for clarity; 
           [0041]      FIG. 3A  is a full cross sectional view taken substantially along section line  3 A- 3 A of  FIG. 3  to illustrate the assembled side view arrangement of the parts therein; 
           [0042]      FIG. 3B  is a graphic illustration of the preferred embodiment of the cam track in which the cam related piston functions are indicated; 
           [0043]      FIG. 4  is a top elevational view of the stationary engine block; 
           [0044]      FIG. 4A  is a full cross sectional view of the stationary engine block taken substantially along section line  4 A- 4 A of  FIG. 4  to clearly illustrate a side view of the internal structure of the stationary engine block; 
           [0045]      FIG. 4B  is an optional or alternative full cross sectional side view layout of the stationary engine block which is horizontally oriented and also taken substantially along section line  4 A- 4 A of  FIG. 4  showing the inclusion of an optional standard type spark plug or glow plug as well as a modified arrangement for the location and mounting of fuel injectors; 
           [0046]      FIG. 5  is an enlarged full cross sectional side assembly view taken substantially along a section line similar to that used in section line  3 A- 3 A of  FIG. 3  to clearly illustrate the assembly of all the major parts of the engine/generator as referenced in  FIG. 1  in their preferred operating orientation; 
           [0047]      FIG. 6  is a top cross sectional view taken substantially along section line  6 B- 6 B of  FIG. 6A  to illustrate the assembled arrangement of the stationary and the rotating parts therein, except that for the sake of clarity, the engine block and the bottom outer case are not shown as a sectional view; 
           [0048]      FIG. 6A  is a full cross sectional side view taken substantially along section line  6 A- 6 A of  FIG. 6 , but assembled and shown with the inclusion of the removed top case of  FIG. 6  to illustrate the assembled arrangement of all the parts therein; 
           [0049]      FIG. 7  is a top cross sectional view taken substantially along section line  7 B- 7 B of  FIG. 7A  and is similar to  FIG. 6 , except for the inclusion of the cam-track layout that is present in the unseen top case and the removal of the radial ball bearings at the cylinders for the purpose of better clarity; 
           [0050]      FIG. 7A  is a full cross sectional side view with assembled top case similar to  FIG. 6A  taken substantially along vantage line  7 A- 7 A of  FIG. 7  and looking in the direction of the arrows thereon; 
           [0051]      FIG. 8  is a top cross sectional view taken substantially along section line  8 B- 8 B of  FIG. 8A  and is similar to  FIG. 7 , except that the rotating cam track assembly as seen in  FIG. 3  and the associated piston assemblies of  FIG. 1A  are shown after partial rotation of the cam-track assembly; 
           [0052]      FIG. 8A  is a full cross sectional side view with assembled top case similar to  FIG. 7A  taken substantially along vantage line  8 A- 8 A of  FIG. 8  and looking in the direction of the arrows thereon to show the effect of the rotation of the cam track assembly of  FIG. 3  on the piston assemblies of  FIG. 1B  as well as on the valve assemblies of  FIG. 1 ; 
           [0053]      FIG. 9  is a top cross sectional view taken substantially along section line  9 B- 9 B of  FIG. 9A  and is similar to  FIG. 8 , except that the rotating cam track assembly as seen in  FIG. 3  and the associated piston assemblies of  FIG. 1A  are shown after additional rotation of the cam track assembly; 
           [0054]      FIG. 9A  is a full cross sectional side view with assembled top case similar to  FIG. 8A  taken substantially along vantage line  9 A- 9 A of  FIG. 9  and looking in the direction of the arrows thereon to show the effect of the additional rotation of the cam track assembly of  FIG. 3  on the piston assemblies of  FIG. 1B  as well as on the valve assemblies of  FIG. 1 ; 
           [0055]      FIGS. 10 and 11  are top cross sectional views each showing another embodiment similar to those shown in  FIGS. 6 ,  7 ,  8  and  9 , except that the direction in which the cylinders extend radically outward is slightly offset. 
           [0056]      FIGS. 12 and 13  are top cross sectional views each showing another embodiment in which the cylinders are offset 90° to a radially outward direction from the center. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0057]    The description which follows will set forth the features of a currently preferred embodiment of this invention and more specifically will describe the features of the engine/generator utilizing a unique environmentally clean operating, two-cycle type, four cylinder engine, with a rotating twin-cam track and generator armature combination, and having a stationary block rotary engine designed to operate at a relatively fixed speed with the purpose of providing an optimized combustion process and increased overall efficiency while producing 220 volts of 3 phase alternating current. This is not the only form that the engine/generator of this invention can take, nor is it the only form of electrical energy it can produce. However, the herein described and illustrated form of this invention is the best mode presently contemplated to enable those skilled in the art to practice this invention. 
         [0058]    As noted,  FIG. 1  is an exploded side sectional elevational view of the engine/generator of this invention illustrating its several major parts which will be referenced from time to time in the description of this invention to follow. 
         [0059]    It will be noted that the elemental portions of the engine/generator illustrated in  FIG. 1  are labeled by number for ease in tracking such designated parts throughout the ensuing drawing figures. 
         [0060]    As shown for the several parts, a reference number designation for each are as listed below: 
         [0000]    
       
         
               
               
             
               
               
             
           
               
                   
               
               
                 Reference Number 
                 Description 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1 
                 Fuel injector clamps 
               
               
                 2 
                 Fuel injectors 
               
               
                 3 
                 Spark plugs 
               
               
                 4 
                 Top case half making up one half of the 
               
               
                   
                 engine/generator enclosure 
               
               
                 5 
                 Ring gear 
               
               
                 6 
                 Snap rings used to retain the radial main bearings 
               
               
                 7 
                 Main radial ball bearings 
               
               
                 8 
                 Spark conductors used to advance the spark to the 
               
               
                   
                 plug-in-piston spark plugs 
               
               
                 9 
                 Upper cam-track plate 
               
               
                 10 
                 Armature ring 
               
               
                 11 
                 Armature magnets 
               
               
                 12 
                 Armature clamps 
               
               
                 13 
                 Stationary engine block 
               
               
                 14 
                 Cylinders 
               
               
                 15 
                 Cylinder sleeves 
               
               
                 16 
                 Pistons (Plug-In-Piston style) 
               
               
                 17 
                 Wrist pin electrode assemblies 
               
               
                 18 
                 Cam roller assemblies 
               
               
                 19 
                 Locating set screws 
               
               
                 20 
                 Valve assemblies 
               
               
                 21 
                 Valve stem (1 per Valve assembly) 
               
               
                 22 
                 Valve body (1 per Valve assembly) 
               
               
                 23 
                 Valve guide (1 per Valve assembly) 
               
               
                 24 
                 Valve spring (1 per Valve assembly) 
               
               
                 25 
                 Exhaust valve cam (1 per Valve assembly) 
               
               
                 26 
                 Exhaust pipe 
               
               
                 27 
                 Exhaust valve cam alignment bearings 
               
               
                 28 
                 Lower cam-track plate 
               
               
                 29 
                 Exhaust valve actuating cam-ring retainer 
               
               
                 30 
                 Exhaust valve actuating cam-ring 
               
               
                 31 
                 Thrust bearing 
               
               
                 32 
                 Stationary electrical coil 
               
               
                 33 
                 Bottom case half 
               
               
                   
               
             
          
         
       
     
         [0061]    There will also be reference made to certain assemblies made up of parts listed above. Those assemblies, and reference number designation for each are as listed below: 
         [0000]    
       
         
               
               
             
           
               
                   
               
               
                 Reference Number 
                 Description 
               
               
                   
               
             
             
               
                 20 
                 Valve assemblies 
               
               
                 39 
                 Piston assemblies 
               
               
                 75 
                 Cam-track/armature assembly 
               
               
                   
               
             
          
         
       
     
         [0062]    Turning now to  FIG. 1A  and  FIG. 1B  of the drawings, there is depicted an enlarged top sectional view ( FIG. 1A ) and an enlarged side sectional view ( FIG. 1B ) of the piston assembly  39  taken to show the respective top and side assembly views generally through the center line of the cylinder sleeves  15 , the “Plug-In-Piston” pistons  16  with their electrodes  36 , insulators  37  and their spark plug heads  38 , from which the combustion spark originates within the combustion chamber at the time of combustion. Also seen are the wrist pin electrode assemblies  17  with their electrodes  34  and the insulating material  35  that is used to connect the “Plug-In-Piston” pistons  16  to the cylinder sleeves  15  in a fixed position so that all parts of the piston assembly  39  move together as a single unit through the interaction of the cam roller assemblies  18  and the outside cam track  45  which will be seen and described in greater detail later in this description. The “Plug-In-Piston” pistons  16  are optional features, and conventional pistons may instead be utilized as well. 
         [0063]      FIG. 2  of the drawings is an exploded side sectional elevational view and the respective top or bottom elevational views of the parts associated with the rotating cam-track/armature assembly. The ring gear  5  may be provided as a means by which ancillary equipment (not shown) such as fuel pumps, oil pumps and air pumps can be operated by the rotation of the cam-track/armature assembly. The ring gear  5  is attached by means of standard locating dowels and fasteners to the top face of the upper cam-track plate  9 . This attachment also provides a clamping nest for the outer race of one of the two main radial bearings  7 , preferably ball bearings, that support and provide accurate, low friction rotation of the cam-track/armature assembly. Two insulated spark conductors  8  are used to advance the spark to the “Plug-In-Piston” spark plugs seen in  FIG. 1A &amp; 1B . The insulated spark conductors  8  may be threadably attached to the upper cam-track plate  9 . The upper cam-track plate  9  may also be provided with a groove near the outside diameter into which the armature ring  10  may be precisely located and attached by means of standard locating dowels and fasteners. The armature ring  10  serves to provide a precise dimension between the upper cam-track plate  9  and the lower cam-track plate  28  which may also be provided with a groove near the outside diameter into which the armature ring  10  may be precisely located and attached by means of standard locating dowels and fasteners. The armature ring  10  also serves to provide a concentric outside diameter onto which the armature magnets  11  may be located and clamped by the armature clamps  12  which are provided with angular ends made to compliment the angular ends of the armature magnets  11 . The armature clamps  12  may be provided with mounting holes made to accept standard fasteners which may threadably connect the armature clamps  12  to the armature ring  10  in order to provide accurate spacing and clamping means for the armature magnets  11 . The armature magnets  11  may be located or otherwise disposed on either/both cam-track plates  9 ,  28  by any conventional means. In another embodiment, the armature magnets  11  and the armature clamps  12  may also be centered, aligned and clamped by their interaction with complimenting angular faces provided in the upper cam-track plate  9  and the lower cam-track plate  28  as can be seen in the assembly drawing  FIG. 3A . The lower cam-track plate  28  is also provided with the second of the two main radial bearings  7 , preferably ball bearings or roller bearings, that support and provide accurate, low friction rotation of the cam-track/armature assembly. The lower main radial bearing  7  may also fit into a nest in the lower cam-track plate  28 , and the outer race of the bearing may be clamped by the attachment of the exhaust valve actuating cam-ring retainer  29  by means of standard locating dowels and fasteners into the lower cam-track plate  28 . The exhaust valve actuating cam-ring  30  with its two raised cam-lands  47  and its two lower cam-lands  48  is located by a machined pocket in the exhaust valve actuating cam-ring retainer  29  and securely mounted by means of standard locating dowels and fasteners. The weight of the entire rotating assembly and the pressure exerted by the forces applied to the two raised cam lands  47  during operation of the engine/generator is applied to the thrust bearing  31 , preferably a ball bearing type thrust bearing, which is in full contact with the cam-ring  30 . The cam-ring  30  is an optional feature. The valves may be actuated by any conventional mechanical or electro-mechanical means. 
         [0064]    In a certain preferred embodiment, the valves may be operated by independent electro/magnetic actuators, or some like devices, and controlled by a computer processor. This is particularly useful in an embodiment in which the use of various different fuels may by desirable. The pressure in the combustion chamber can be regulated and modified during operation (on-the-fly), in order to optimize the combustion characteristics of multiple fuel types by controlling the timing of the exhaust valves closing. 
         [0065]    For example, when the engine is operating during periods of heavy load a high-energy fuel, such as diesel fuel, which requires much higher cylinder pressures may be more desirable. The exhaust valve in this example would be made to close early, shortening the internal cylinder cooling cycle and allowing more time in the pre-compression mode, prior to the inward movement of the piston, to pre-pressurize the cylinder with fresh air. This action will provide much higher cylinder pressures after the compression cycle. Conversely, during times of low output requirements and low engine loads, a less powerful but cleaner and less expensive fuel, such as natural gas, may be more desirable. During these times the compression ratio in the cylinders would be reduced by closing the exhaust valve later, even after the inward movement of the piston has begun in the compression cycle, thereby allowing fresh air within the cylinder to escape out the exhaust valve, reducing the volume of air to be compressed in the cylinder. This action also reduces the operating loads within the engine, further increasing efficiency of operation. 
         [0066]    It should be noted that even in the situation of a single fuel being used, it may be advantageous to control cylinder pressure and the amount of fresh air within the cylinder based on load, allowing more compressed air as the amount of load increases, and therefore the amount of fuel is also increased. Conversely, the valves may be timed to lower cylinder pressure and fresh air volume within the cylinder as the amount of load and fuel is decreased. 
         [0067]    The computer processor may be pre-programmed to time the actuation of the valves based upon an input for certain fuel types and/or based on current load values. Alternatively, or in conjunction with the above, the engine may be provided with combustion and exhaust sensors, and feedback from those sensors may be input into the computer processor to optimize the valve timing automatically based on current conditions. 
         [0068]    Attention should be given to the two opposing top and bottom views of the upper cam-track plate  9  and the lower cam-track plate  28  where the outer cam-track surface  45  and the inner cam-track surface  46  can be seen. It should be clear that the cam-track configurations for both the upper cam-track plate  9  and the lower cam-track plate  28  are mirror images of each other. It should also be noted that the precise alignment of the cam-track plates may be assured by the use of standard locating dowels and fasteners when assembled to the armature ring  10 . 
         [0069]      FIG. 3  is a top elevational view of the assembled rotating cam-track/armature parts illustrated in  FIG. 2  with the outer cam-track surface  45  and the inner cam-track surface  46  shown highlighted as solid lines for clarity.  FIG. 3A  is a full cross sectional view taken substantially along section line  3 A- 3 A of  FIG. 3  to illustrate the assembled side view arrangement of the rotating cam-track/armature parts therein. Both  FIG. 3  and  FIG. 3A  depict the arrangement and interaction of the assembled parts. The ring gear  5  is clearly seen in  FIG. 3  and  FIG. 3A . In  FIG. 3  the ring gear  5  is clearly seen attached by means of standard locating dowels and fasteners to the upper cam-track plate  9 . The main radial bearings  7  are also clearly visible in  FIG. 3 , and the nested and clamped arrangement of the outer bearing race of the upper main radial bearing  7  is evident in  FIG. 3A . 
         [0070]    The armature ring  10  can be seen in  FIG. 3  as well as the locating dowels  50  and the standard fasteners  51  that are used to secure the precise location of the upper cam-track plate  9  relative to the armature ring  10 . It should be understood that the same precise location and fastening means may be used to secure the armature ring  10  to the lower cam-track plate  28 . Precise construction holes  49  may be provided in both the upper cam-track plate  9  and the lower cam-track plate  28 . These holes may serve not only to insure the precise location of the upper cam-track plate  9  and the lower cam-track plate  28  during machining, but may be provided as a vent, or escape hole to prevent the accumulation of lubricating oil in the rotating cam-track assembly during operation. In  FIG. 3A  the grooves near the outside diameter of the upper cam-track plate  9  and the lower cam-track plate  28 , into which the armature ring  10  may be precisely located and attached, can be clearly seen. The angular clamping arrangement of the upper cam-track plate  9  and the lower cam-track plate  28  on the armature magnets  11  are also evident in  FIG. 3A . In  FIG. 3 , the armature magnets  11  with their angular ends can be seen as they interact with the angular ends of the armature clamps  12  which may be threadably attached to the armature ring  10  by means of the standard fasteners  52  providing precise and secure location of the armature magnets  11  on the outermost diameter of the cam-track/armature assembly. 
         [0071]    In  FIG. 3A , the exhaust valve actuating cam-ring retainer  29  can be seen located in an under-cut portion of the lower cam-track plate  28  where it is securely held in place and positioned by standard locating dowels and fasteners. The nested and clamped arrangement of the outer bearing race of the lower main radial bearing  7  is again evident because of the attachment of the actuating cam-ring retainer  29  to the lower cam-track plate  28 . The exhaust valve actuating cam-ring  30  may also be located in an under-cut portion of the exhaust valve actuating cam-ring retainer  29  where it may also be securely held in place and positioned by standard locating dowels and fasteners. The preferred orientation of the exhaust valve actuating cam-ring  30  and its two raised cam lands  47  can be seen in  FIG. 3  and in  FIG. 3A . 
         [0072]    Finally, the entire assembly of the cam-track and the generator-armature parts as seen in  FIG. 3  and  FIG. 3A  will be referred to in the remainder of this description as the cam-track/armature assembly  75 . In  FIG. 3A  the cam-track/armature assembly  75  can be seen resting on the thrust bearing  31  which would be oriented on a horizontal plane at the bottom of the cam-track/armature assembly  75 . The thrust bearing  31  is oriented on the same center line as the cam-track/armature assembly  75 , directly under the raised cam lands  47  and is in full surface contact with the bottom surface of the exhaust valve actuating cam-ring  30 . The thrust bearing  31  is located in a pocket in the bottom case half  33  (see  FIG. 1 ) which will be seen in detail later in this description. 
         [0073]      FIG. 3B  is a graphic illustration of the preferred embodiment of the cam track in which the cam related piston functions are indicated. It should be clear that in this preferred embodiment, the cam-track configuration is such that each cylinder of the engine/generator will provide two complete combustion events in the course of a single 360 degree rotation of the cam-track/armature assembly  75  of the engine/generator. Therefore, the four cylinder engine/generator which is shown will produce eight complete combustion events in the course of one single rotation of the cam-track/armature assembly  75 . It must be understood that the number of cylinders as well as the number of combustion events per revolution is only limited by the physical size and output requirement of the particular engine/generator design. There are no limitations on the number of cylinders, magnets/electromagnets or combustions per revolution implied in this preferred embodiment. It should also be noted that  FIG. 3B  is only provided to clearly show the great flexibility of the design that is offered by this configuration. 
         [0074]    It will be noted that the engine hereof is in many respects similar to the teaching and disclosure of a four cylinder engine set forth in my prior U.S. Pat. No. 4,653,438 issued Mar. 31, 1987, entitled “Rotary Engine” and also in my disclosure of a six cylinder engine/generator set forth in my prior U.S. Pat. No. 6,230,670 issued May 15, 2001 entitled “Engine Generator”, both of which are incorporated herein by reference in their entirety. Certain exceptions to the later “Engine Generator” of that patent are found in the stationary engine block  13 , the rotating cam-track/armature assembly  75 , the simplified top case half  4 , the simplified bottom case half  33 , the main radial bearings  7 , the direct injection capabilities of the fuel injectors  2 , the improved hemispherical head design  60 , the improved engine block water cooling capability and the new “Plug-In-Piston” assemblies  39  (Pat. Pending). It should also be noted that the cylinders used in this current invention are modified from my prior U.S. Pat. No. 5,636,599 issued Jun. 10, 1997, entitled “Cylinder Assembly” and the valve assemblies used in this current invention are from my prior U.S. Pat. No. 5,701,930 issued Dec. 30, 1997, entitled “Modular Valve Assembly”, both of which are incorporated by reference in their entirety. 
         [0075]    Turning now to  FIG. 4  and  FIG. 4A , in general it is to be understood that the engine portion of the engine/generator comprises a stationary engine block  13 . The stationary engine block  13  may have a shape similar to that of a wheel with a central hub that contains the combustion chambers  60 , bores  59  to receive and threadably secure the exhaust valve assemblies  20  ( FIG. 1 ) and exhaust bores  62  to communicate exhaust gasses to the threaded exhaust pipe  26  ( FIG. 1 ) which may be secured to the stationary engine block  13  at the threaded bore  65 ). There may be a radial groove  63  provided in the engine block  13  to accept the exhaust valve cam alignment bearings  27  ( FIG. 1 ) which may be used to insure the proper alignment of the exhaust valve cams  25  ( FIG. 1 ). The two main radial bearings  7  ( FIG. 1 ) may be located with a light resistance fit on surfaces  55  and secured by snap rings  6  ( FIG. 1 ) that fit into the snap ring slots  56  of the stationary engine block  13 . During operation, cylinder purge and cooling air may be conveyed into the cylinders through the purge air port  57  into a relief groove  58  that surrounds the cylinders  14  ( FIG. 1 ) and directed into the cylinder through the cast port  71  ( FIG. 8A ) which may be located in the outside diameter wall of the cylinder ( 14 ) and into the cylinder at the cast port  72  ( FIG. 8A ) which may be located in the inside diameter wall of the cylinder  14 . The fuel injector bore  61  with a counter bored seat may be provided for each combustion chamber at the innermost quadrant of the hemispherical combustion chamber. This fuel injector bore  61  may be used to accept fuel injectors  2  ( FIG. 1 ) and thereby convey fuel into the cylinders at the proper time prior to combustion. In this view, eight coolant holes  64  are shown which are cast into the hub portion of the stationary engine block  13 . These cast holes may be located in close proximity to the combustion chambers  60  as well as the bores  59  used to receive the exhaust valve assemblies ( 20  in  FIG. 1 ) and provide cooling to those areas where combustion heat is concentrated. Looking now toward the outside diameter of the stationary engine block  13 , four open windows are optionally provided through the stationary engine block  13  defined by eight parallel curved stiffening walls. These stiffing walls are further defined by the cross sectional view ( 54  in  FIG. 4 ). The web sections between the adjoining stiffening walls may be provided with holes  53  through the web to reduce weight and allow lubricating oil to drain freely. The purpose of the webs and the stiffening walls is to provide rigid support for the outermost ring of the stationary engine block  13  which is used to support the outermost ends of the cylinders  14  (Fig,  1 ). The cylinders  14  ( FIG. 1 ) may be threadably attached to the stationary engine block ( 13 ) at both ends of the cylinders using the threaded sections ( 66  in  FIG. 4  and  FIG. 4A ). 
         [0076]    In  FIG. 4B  we can see a horizontally oriented optional configuration for the stationary engine block  13 . In this configuration all the features of  FIG. 4  and  FIG. 4A  are the same with the exception of the location of the fuel injector  2  the addition of the fuel injector clamp  1  into the stationary engine block  13  and the addition of a standard spark or glow plug  3  directly into the combustion chamber  60 . These modifications or options are provided to allow the engine/generator to function in the most efficient manner possible regardless of the fuel being used. For example, if a heavy fuel such as diesel is being used it would be desirable to use a glow plug rather than a spark plug and the configuration seen in  FIG. 4B  would be the most appropriate for glow plug applications. In some high energy or high efficiency applications it may be preferable to have two separate sparks provided at different locations in the cylinder and fired at different times during the combustion process to provide maximum combustion. In those applications both the Plug-In-Piston configuration, which will be defined in greater detail later in this description, and the stationary spark plug as seen in  FIG. 4B  inserted directly into the combustion chamber  60  could be used. Finally, in those applications where economy is a priority, the configuration seen in  FIG. 4B  would be more desirable than the more expensive Plug-In-Piston design. In those applications a standard, solid piston with no spark plug included in it would replace the Plug-In-Piston design. These changes or options have no other effect on the overall design of the engine/generator being described in this preferred embodiment. 
         [0077]      FIG. 5  is a complete assembly of all the parts noted in  FIG. 1  and is shown as an exploded side sectional elevational view of the engine/generator of this invention. This view also shows this preferred embodiment of the engine/generator in its preferred operating position which is horizontally oriented with the exhaust pipe  26  located on the bottom during operation. Two of the four valve assemblies  20 , and two of the four piston assemblies  39  can be seen, as well as the rotating cam-track/armature assembly  75 . The cylinders  14  can be seen threadably attached to the stationary engine block  13 . The Plug-In-Pistons  16  ( FIG. 1A  and  FIG. 1B ) of the piston assembly  39  can be seen inside the cylinders  14  and attached to the cylinder sleeves  15  ( FIG. 1A  and  FIG. 1B ) which are in a slip fit arrangement with the outside diameter of the cylinders  14  and connected to the Plug-In-Pistons  16  ( FIG. 1A  and  FIG. 1B ) by the wrist pin electrode assemblies  17  making the complete piston assembly  39 . The operation of the Plug-In-Piston design can be best understood in this view of the engine/generator. As can be seen, the cam-track/armature assembly  75  is in a rotational position such that the spark conductors  8 , used to advance the spark to the Plug-In-Piston assembly  39  and ultimately to the spark plug heads  38  seen in  FIG. 1A  and  FIG. 1B , are in alignment with the spark plugs  3  mounted in the top case half  4 . A high energy spark is jumped from the spark plug  3  to the spark conductor  8  and again to the wrist pin electrode  34  of the piston assembly  39  causing an ignition spark at the spark plug head  38  in the combustion chamber  60 . The advantages of this unusual configuration are described in greater detail in my pending patent application titled “Plug-In-Piston” U.S. Ser. No. 12/142,999, incorporated by reference herein in its entirety. In later views of the stationary block engine/generator the rotational movement of the spark conductor  8  with the cam-track/armature assembly  75 , as well as the movement of the piston assembly  39  in response to the ignition and explosion of the selected fuel in the combustion chamber  60 , is shown. 
         [0078]      FIG. 6  and  FIG. 6A  are paired together to show the operation of the stationary block engine/generator from two related vantage points.  FIG. 6  is a top cross-sectional view taken substantially along section line  6 B- 6 B of  FIG. 6A  to illustrate the assembled arrangement of the stationary and the rotating parts therein, except that for the sake of clarity, the engine block  13  and the bottom case half  33  are not shown hatched as a sectional view, and the cam roller assemblies ( 18  in  FIG. 1A ) are shown to aid in the clarity of the description of operating events that follow.  FIG. 6A  is a full cross-sectional side view taken substantially along section line  6 A- 6 A of  FIG. 6 , but assembled and shown with the inclusion of the removed top case  4  and all the associated parts therein of  FIG. 6  to illustrate the assembled arrangement of all the parts therein. 
         [0079]      FIG. 6  shows several features of the assembly. The outermost diameter of the bottom case half  33  is shown, as well as the flange where the standard locating dowels and fasteners are used to securely attach the two case halves in assembly. The stationary electrical coil  32  and the coil output wires  67  are used to transmit the electrical energy produced through the interaction of the rotating armature magnets  11  of the rotating cam-track/armature assembly  75  as they pass the coil windings of the stationary electrical coil  32  in response to the ignition of fuel in the combustion chambers  60 . The cylinders  14  can again be seen, in this top view, threadably attached to the stationary engine block  13 . The Plug-In-Pistons  16  ( FIG. 1A  and  FIG. 1B ) of the piston assembly  39  can be seen inside the cylinders  14  and attached to the cylinder sleeves ( 15  in  FIG. 1A  and  FIG. 1B ) which are in a slip fit arrangement with the outside diameter of the cylinders  14  and connected to the Plug-In-Pistons  16  ( FIG. 1A  and  FIG. 1B ) by the wrist pin electrode assemblies  17 , making the complete piston assembly  39 . Special consideration should be given to the main radial bearings  7  as seen in  FIG. 6 . In this view the entire lower main radial bearing  7  is shown, however, in all future top views of the engine/generator the lower main radial bearing  7  will be shown only partially for the purpose of increased clarity. The lower main radial bearing  7  will not be shown within the area defined by the outside diameter of the cylinders  14  of any future top views. Finally in this view the eight coolant holes  64  are again visible in close proximity to the combustion chambers  60 . 
         [0080]    Both related views  FIG. 6  and  FIG. 6A  show additional cooling features. These cooling features are directed to the cooling of the sealed stationary electrical coil  32  within the stationary case  4 ,  33 . Preferably, there may be an under-cut portion  69  provided in both the stationary upper case half  4  and the lower case half  33 . Although, any number of under-cut portions  69  may be provided. As shown, these under-cuts provide two separate spaces, channels or cooling fluid pathways  70  between the stationary electrical coil  32  and the two case halves ( 4  &amp;  33 ). These cooling fluid pathways  70  are intended to carry any suitable cooling fluid, such as air, water, coolant or oil, across the outermost surface of the sealed stationary electrical coil  32 . Preferably this cooling fluid will be circulated around the sealed stationary electrical coil  32  through the cooling fluid pathways  70  in opposite directions to provide more even cooling around the entire outside diameter of the sealed stationary electrical coil  32 . This is a very desirable feature especially during times of high energy output or continuous duty operation. The cooling fluid may also be circulated through other parts of the engine block  13 . 
         [0081]      FIG. 7  and  FIG. 7A  are quite similar to  FIGS. 6  and  FIGS. 6A  although for increased clarity regarding the operation of the engine/generator the outside cam-track  45  and the inside cam-track  46 , which are located in the unseen top portion of the cam-track/armature assembly  75 , more specifically in the upper cam-track plate  9  are shown. The outside cam-track  45  and the inside cam-track  46  will be seen in all future views. It should be understood that during operation the cam-roller assemblies  18  are in constant and continuous contact with the outside cam-track  45  insuring the constant and continuous rotational direction of the cam-roller assemblies  18  during operation. Clearance is provided between the cam-roller assemblies  18  and the inside cam-track  46  to insure that no contact is made during normal running operation. It should be noted that contact with the inside cam-track  46  by the cam-roller assemblies  18  is only made for a brief period during start-up and during shut-down of the engine/generator. In this view we can see that the lower main radial bearing  7  has been removed from the areas within the cylinders  14  for increased clarity as mentioned before. 
         [0082]    Looking now at the operation of the stationary block engine/generator as seen in  FIG. 7  and  FIG. 7A , the position of the piston assemblies  39  can be seen in the two opposing cylinders  14 A. The piston assemblies  39  are located at the top of their stroke, the exhaust valve stems  21  are closed in the valve assemblies  20 , fuel has been injected into the two combustion chambers  60  related to the cylinders  14 A, the cam-track/armature assembly  75  is in a rotational position such that the spark conductors  8 , used to advance the spark to the piston assembly  39  and ultimately to the spark plug heads  38  seen in  FIG. 1A  and  FIG. 1B , are in alignment with the spark plugs  3 . A high energy spark is jumped from the spark plugs  3  to the spark conductors  8  and again to the piston assembly  39  causing an ignition spark at the spark plug head  38  in the combustion chamber  60 . As the rotational direction of the cam-track/armature assembly  75  in the preferred embodiment is clockwise the pressure exerted on the piston assembly  39  by the combustion of fuel in the combustion chambers is translated to the cam-roller assemblies  18  which are in constant and continuous contact with the outside cam-track  45 , and that this rotational movement of the cam-track/armature assembly  75  with its included outside cam-tracks  45  and the inside cam-tracks  46  will bring the two angular descending surfaces  45 A into contact with the pressurized cam-roller assemblies  18  causing rotation of the cam-track/armature assembly  75  and further causing the production of electricity through the interaction of the magnets in the cam-track/armature assembly  75  and the stationary electrical coil  32 . 
         [0083]      FIG. 8  and  FIG. 8A  are quite similar to  FIGS. 7 and 7A  except that in these views the cam-track/armature assembly  75 , with the included cam tracks  45  and  46 , has been rotated in a clockwise direction (a total of 32.5 degrees from  FIGS. 7 and 7A ) as a direct result of the combustion event seen in  FIGS. 7 and 7A . The piston assemblies  39  are now at the bottom of their stroke and the exhaust valve stems  21  are fully opened as a result of the interaction of the exhaust valve cam  25 , of the exhaust valve assemblies  20 , with the raised cam-lands  47 , of the exhaust valve actuating cam-ring  30 . The combustion event is now complete and exhaust is allowed to leave the cylinders  14 A through the opened exhaust valve stems  21  and out the exhaust pipe  26  by way of the exhaust ports  62  in the stationary engine block  13 . As there is no movement of the piston assemblies  39  at this time there is no combustion energy lost during the exhaust cycle of the stationary block engine/generator, as in conventional engines where the piston immediately moves inward, back to the top of the piston stroke, forcing exhaust gasses out of the cylinders at great pressure and consequently great inefficiency and loss of usable energy. 
         [0084]    The next event in the operation of the stationary block engine/generator is the cylinder purge and cooling cycle, which is again accomplished with relatively no movement of the piston assemblies  39 , greatly increasing the amount of usable energy produced during the combustion event. Once the cylinders  14 A are decompressed because of the open exhaust valve stems  21 , cylinder purge and cooling air is allowed to enter the cylinders under pressure by way of one or more ancillary valves (preferably an ancillary rotary valve, although any conventional valve is acceptable) not seen but preferably operated by the ring gear  5 . The ancillary air valve/valves may also be operated/actuated by any other conventional means. The cylinder purge and cooling air enters the cylinders by way of the threaded port  57  in the top case half  4 , to the relief groove  58  that surrounds the cylinders  14 A, and is directed into the cylinders through the air intake port  71  ( FIG. 8A ) which is located in the outside diameter wall of the cylinders  14 A and into the cylinders at the air purge port  72  ( FIG. 8A ) which is located in the inside diameter wall of the cylinders  14 A and now exposed to the internal cylinder by the fully extended position of the piston assembly  39 . The purge and cooling air circulates through the entire length of the cylinders and combustion chambers escaping through the still open exhaust valve stems  21 , cooling the cylinders, combustion chambers, exhaust valves, the exhaust valve assemblies, the stationary block and the exhaust pipe. This process insures that spent gases in the cylinders and combustion chambers from the previous combustion are removed prior to the next combustion, improving the new combustion efficiency, increasing combustion energy and reducing pollution while increasing overall efficiency and usable energy production. There is another positive result experienced because of this purge and cooling event. Because the entire usable lengths of the cylinders  14  are cooled internally, their internal surface temperatures are lower when the new fresh combustion air is finally introduced to the cylinder. Because the internal surface temperatures of the cylinders are cooler, there is less pre-expansion of the air in the cylinder prior to combustion, allowing greater expansion of those gases during and after the combustion event. This means greater energy production from the combustion event as a result of greater expansion of the gases within the cylinders after combustion, which in turn produces higher cylinder pressures, which are then exerted on the piston assembly  39  thereby producing more power per combustion event and more usable output energy, and therefore greater overall efficiency and lower fuel consumption. 
         [0085]    This purge and cooling event is not effectively possible in a conventional engine because there is no substantial amount of time for which the reciprocating pistons are in a fully extended, relatively stationary position. With the present invention, because the pistons may remain at or near a fully extended position, following each combustion event, for a much longer amount of time, this allows an opportunity for air to be introduced into the cylinders through the air purge ports to cool and evacuate the cylinders. 
         [0086]      FIG. 9  and  FIG. 9A  are quite similar to  FIGS. 8 and 8A  except that in these views the cam-track/armature assembly  75 , with the included cam tracks  45  and  46 , has been rotated still farther in a clockwise direction (a total of 90 degrees from  FIGS. 7 and 7A ), as a direct result of the combustion event seen in  FIGS. 7 and 7A . At this point the cylinder purge and cooling cycle is still in progress. Before the cylinder purge and cooling cycle has been completed the entire volume of air in the cylinders  14 A will have been replaced several times insuring a cool and clean environment to maximize the next combustion event. The exhaust valve stem  21  is still open in these views, and it will remain open until shortly before the next compression cycle when the piston assembly  39  begins to move slowly inward due to the interaction of the cam roller assemblies  18  and the gradually increasing camming angle of the outer cam-track  45  as seen at  45 B. This slower acceleration of the piston assembly will again conserve energy which can then be converted into usable output energy by the generator portion of the engine/generator assembly, further increasing overall efficiency. 
         [0087]    In  FIGS. 9 and 9A , the cylinders  14 B are now in the same ignition position that the cylinders  14 A were in, in  FIGS. 7 and 7A . The cylinders  14 A of  FIGS. 9 and 9A  are still in the purge and cooling cycle with the exhaust valve stems  21  still open. The exhaust valve stems  21  will remain open for another 24.6 degrees of clockwise rotation of the cam-track/armature assembly  75  and the cylinder purge and cooling cycle will continue for another 35.6 degrees of rotation of the cam-track/armature assembly  75 . In this preferred embodiment the exhaust valve stem  21  closes 11 degrees prior to the end of the purge/cooling cycle. This configuration therefore allows the cylinders to be pre-pressurized by the purge/cooling air prior to the inward movement of the piston assembly  39  which is caused by the interaction of the cam roller assemblies  18  and the outer cam-track  45 . This action will provide for greater cylinder pressures prior to combustion. If it is determined that lower cylinder pressures are desirable prior to combustion, the timing of the valve stems  21  closure can be simply adjusted to occur after the purge/cooling cycle is complete, reducing pre-compression cylinder pressures. The valve stem closure can be further delayed so as not to occur until after partial assent of the piston assembly  39  on the outer cam-track  45  during the compression cycle, further reducing internal cylinder pressures prior to combustion if so desired. 
         [0088]    As noted above, the cylinders  14 B are now in the same ignition position that the cylinders  14 A were in, in  FIGS. 7 and 7A . The cam-track/armature assembly  75  of the stationary block engine/generator has only rotated 90 degrees since the last combustion event where two opposing cylinders and combustion chambers experienced combustion. It should also be clear that each cylinder has a combustion event once in the course each 180 degree rotation and therefore twice in the course of one complete 360 degree rotation. The four cylinder stationary block engine/generator as shown will therefore produce eight complete combustion events in the course of one 360 degree rotation. 
         [0089]    While the preceding preferred embodiments are described and depicted to show each of the cylinders  14  extending radially outward from the center, it is possible to configure the cylinders in may different ways. 
         [0090]      FIGS. 10 and 11  are a top cross-sectional view, each showing another variation of the cylinder arrangement. Reference numerals have been omitted for clarity, but the elements in each figure may be readily identified by any of the preceding  FIGS. 6 ,  7 ,  8  and  9 .  FIGS. 10 and 11  each show an embodiment in which the orientation of the cylinders has been offset slightly, either to the left or right, from extending directly radially outward from the center. 
         [0091]      FIGS. 12 and 13  each depict a top cross-sectional view in which the cylinder arrangement is even further offset to extend 90° from a radially outward direction from the center. As can be seen in these figures, such an offset arrangement results in an even more compact design which may be desirable for certain applications. The offset cylinder configuration while being more compact will however increase the loads placed on components of the engine during operation. 
         [0092]    A combination of cylinder arrangements and multiple cam-tracks in a single cam-track plate is also possible, but not depicted. 
         [0093]    It will be recognized that the foregoing explanation associated with  FIGS. 1-9A  have followed the events occurring in one quarter (90 degrees) of one revolution of the cam-track/armature assembly  75  of the stationary block engine/generator. It is to be recognized by one familiar with the interior workings of a typical engine that the herein disclosed engine and generator combination of the stationary block engine/generator represents a great leap forward in the search for an extremely power dense, lightweight, economical, dependable and reliable source of electrical power, contained in an extremely small package, that is useful for virtually any and all portable, as well as stationary applications. It is also to be recognized that the herein disclosed engine of the stationary block engine/generator is capable of operating using any single fuel or combination of liquid and/or gaseous fuels commonly used in the operation of internal combustion engines. It should also be recognized that, due to the increased power density and overall efficiency, the herein disclosed engine of the stationary block engine/generator is capable of operating on lower grade fuels than are commonly used in the operation of standard internal combustion engines. 
         [0094]    Having described this invention, it is believed that from the foregoing those skilled in the art will readily recognize and appreciate the novel advancement represented by this invention and will understand that the embodiment hereinabove described and illustrated in the accompanying drawings, while being preferred, is susceptible to modification, variation and substitution of equivalents without departing from the spirit and scope of the invention, which is intended to be unlimited by the foregoing, except as may appear in the following appended claims.