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   ocr: GAS ENGINE DISLUSSIUN The "gas" engine is more correctiy called the spark ignition or S.I. - engine because the burning of the fuel air mikture 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, throttie setting, Tuel-air ratio and temperature to name 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 ma ...