Gasoline Engines Gas engines are known as internal combustion engines and are divided into two general classes, specifically two cycle and four cycle engines. A cycle of an engine represents one stroke of the piston or one half revolution of the crank shaft, as a complete revolution represents two cycles. With a two cycle engine, the power impulse occurs at each revolution, while with four cycle engines it occurs at every other revolution, hence the terms two and four cycle engines. Both classes have their own specific advantages and uses. For autombiles, the four cycle engines is most used. For motor boats on the other hand, the two cycle engine is most often used. The horse power of gas engines is designated as HP and also brake test HP. The IHP is the theoretical HP, which is found by figuring different formulas, in which the diameter of the bore, length of the stroke in inches, and number of revolutions per
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