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   ocr: GHS ENGINE DISCUSSIUN The "gas" engine is more correctiy called the spark ignition or S.1. engine because the burning of the fuel air mixture drawn into the cylinder is initiated by a spark, which occurs at about the top of the compression stroke. The exact timing depends on several ractors, including the engine speed, throttle setting, fuel-air ratio and temperature to Tame a few. The spark ignites the fuel air mikture; a flame front then propagates rapidly (and silently) across the combustion chamber, heating the gas and thereby raising the pressure in the cylinder. The etticiency and masimu ...