![]() ![]() A four-stroke cycle includes an intake and compression step (one crankshaft revolution) and a power and exhaust step (one crankshaft revolution). ![]() 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.
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