Patent GB-763081-A (GB)
Title: Improvements in or relating to multi cylinder internal combustion engines
IPC: F02F1/24
Filed: 1953-12-21
Abstract: 763,081. Cylinders; heating charge; spray carburetters. WESLAKE, H. March 21, 1955 [Dec. 21, 1953], No. 35534/53. Classes 7 (2) and 7 (3). In a cylinder head block for a multi-cylinder engine, inlet and exhaust valve ports are arranged in line with one another along the length of the block and each inlet port is fed by at least two inlet passages 16, 17 which may be so arranged as to promote charge swirling. As shown in Fig. 6, parallel passages 16, 17 are offset on opposite sides of an inlet valve 14, to a flat-roofed combustion chamber and the valve guide 25 projects downwards into the passages 16, 17 and may have swirl-increasing vanes 27. There is an exhaust passage 18. In Fig. 1 (not shown) both passages 16, 17 are offset to the same side of the inlet valve and meet at the inlet port in downwardly and laterally curved portions of venturi shape, there being duplication of this arrangement in Fig. 4 (not shown) where the passages 16, 17 each split to serve two inlet ports of adjacent cylinders. The passages 16, 17 may be fed in various ways e.g. each passage may have a separate carburetter, especially in a four-cylinder engine, or a single induction manifold pipe on each side of the cylinder head may be fed by one or more carburetters, or there may be a number of manifold pipes and corresponding carburetters on each side of the head. Again, especially in conjunction with the last-named arrangement on the other side of the head, the inlet passages on one side of the head may be connected to an un-fed manifold pipe sealed off from the atmosphere. In a four-cylinder engine, Fig. 8, one carburetter 50 supplies low grade fuel, e.g. tractor vaporizing oil or paraffin, to all the inlet passages 16, and another carburetter 49 higher grade fuel, e.g. alcohol mixture, to all the inlet passages 17, the central portion of one inlet manifold 43 being bolted to the exhaust manifold at 47 to form a hot spot. The carburetters may be controlled so that one supplies combustible mixture before the other ; ordinary hydrocarbon fuel may be supplied to one inlet manifold, and an alcohol mixture to the other under full throttle conditions, either by a carburetter or by an injection system ; the two inlet manifolds may be fed with combustible mixtures of different strengths, or one with air and the other with rich mixture, e.g. under the control of throttle valves so interlinked that the valve controlling the rich mixture opens before that controlling the air or weak mixture ; a supercharger may be associated with either or both inlet manifolds. The invention is applicable to four-stroke and two-stroke engines, particularly to a two-stroke supercharged diesel supplying the heated charge to drive a gas turbine. Reference is made to the passages 16 and 17 being of different sizes and, in the Provisional Specification, to a cylinder head having a part-spherical or pent-house shaped combustion chamber, inlet and exhaust ports on opposite sides of the cylinder axis and substantially vertical and horizontal passages 16 and 17.