A four-stroke engine takes two crankshaft revolutions to complete one engine cycle with the piston moving through 180° to complete each step in the cycle.
Two stroke engines are common on microlights and some smaller ultralight aircraft, as these engines have a lower part count making them simpler to operate and cheaper to procure and maintain.įour-stroke engines are the most common engine type in use in the general aviation industry and it is this engine type that we will study further. Two-stroke engines complete a cycle in one revolution of the crankshaft with two movements an up and down stroke of the piston which incorporates intake, compression, combustion and exhaust. Piston engines are classified according to the number of distinct steps that the engine performs in one complete engine cycle. Four-stroke engines are the predominant type seen in general aviation and form the topic of this post.
Most internal combustion engines work on one of two principles of operation: a two-stroke cycle or a four-stroke cycle.
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