Pine Bluff daily graphic., 1915-05-02

would 1t De pOSSiple 10 cIean carpon out by putting the cylinders into pail of kerosene and leaving them for about day?
 As long as you are going to remove the cylinders it is best first to soak them in kerosene. as you suggest. This will probably not remove the carbon, but will merely loosen it. It should be taken off by scrapjng with a soft, blunt metal tool such as screw. driver. It should not be hard to reach the corners when the cylinders are re- moved
 What is the difference in construc- ton between ordinary and cord tires7
 Ordinary tires use a fabric carcass or one made of q tough grade of duck or canvas. while cord tires are built up on a cord carcass, the latter usually being woven in such way as to impart great diagonal strength, rendering the tire less susceptible to vertical stress than with some other constructions.
 Will you please explain the difference between tho dual, double, single, two point and duplex electric ignition sys- tems?
 ,The dual system employs two inde- pendent sources of current. but uses a common set of spark plugs and a com mon high tension distributor. The dou- bic system employs two independent systems throughout. with two sets of spark plugs. two sources of ignition, two coils and two distributors. The single ignition system has but one source of current, one transforming system, one distributor and one set of plugs. Two point ignition is where two Sparks occur at the same time in the. 'cyIinder.,. It must of necessity, therefpte. involve two sets of plugs and sJIichronized distributors. .. Duplex ignition is that in which both 8 battery and magneto current source are used, but in which the battery is in such way that 1t can produce a high tension spark by means of the secondary winding of the magneto or aid the primary at low motor speeds.
 have found that the higher test gasoline l use the more power 1 get and the hotter my engine gets. Will ! injure my motor by using a mixture of motor and illuminating gasoline if tho water circulates freely and does not boil? The dealer tells mo his motor gas tests GA and the illuminating gas 72-76 and sometimes more.
 As long as the cooling water does not boil it is certain that the motor is operating within the safe range of temperature.
 Can you tell me about what the pressure DOT square inch is on the pis- ton of motor at the time of firing; also the pressure at the time the ex- haust valve starts to open?
 The pressure per square inch at ex' plosion depends upon the motor itself to large extent. but on ordinary four cycle gasoline engines, operating at 8 mean effective pressure of ninety pounds to the square inch and ter. minal pressure of forty pounds to the square inch. the combustion pressure on good average card taken by the monograph would be about 300 pounds to the square inch.
 When running on tho level or down grades at fair rate of speed there is a singing noise that seems to be on the left side of my gear box, but going up grade can run as fast as l desire and the noise is not there. 1 can give tho car good start down grade and free the engine and do not hear it any moro until l engage the clutch again. lt does not seem to injure the pulling at all, but it seems as if there were some parts rubbing. This has boon in tho car for long time.
 From the description which you give 1t would seem that the noise Is pro- duced by the drive shaft pinion and the differential gear not meshing prop l erly. In order to overcome this it will be necessary for you to install special heat treated parts. The fact that the pinion and gear are not meshlng prop clly SduSCS A "hA\h cCCc up vibration, producing the humming CT singing noise.
 Why and how does four cycle en- zine back fire in the intake manifold from lean mixture when the engine is cold and spark rstardedf
 A mixture which is too lean may not explode or, if it does. the explosion will be poor one in which part of the mixture burns slowly. with flame. The flame sticks to the cylinder wall until the inlet valve opens. and then the inrushing fresh charge also is ig- nited, causing an explosion of the gases in the inlet manifold and mixing chamber. e
 | would like to know whether could not substitute a six volt storage bat. tery for the four dry cells used for ig- sition on my car?
 Rather than go to the expense of a | storage battery for this work. it would be probably better for you to use more j-txr 1,lic s.v,d ;v,v 11ol