Turn The Crankshaft One Revolution And The Piston Completes Several Strokes

One revolution of the crankshaft will complete two strokes of the piston. When the crankshaft rotates for one revolution, the movement of the piston depends on the working cycle of the engine. Typically, modern internal combustion engines use a four stroke cycle, which means that each piston needs to complete four cycles to complete one job.

The four cycles are:

Intake stroke: The piston moves downward from the top dead center, sucking in the mixture.

Compression stroke: The piston moves upward from the bottom dead center, compressing the mixture.

Combustion stroke: The mixture combusts under the action of ignition, generating explosive force, pushing the piston downward from bottom dead center, and outputting power.

Exhaust stroke: The piston moves upward from the bottom dead center to exhaust the exhaust gas from the cylinder. Therefore, when the crankshaft rotates one revolution, each piston needs to complete two strokes, that is, a round trip motion, and completing four strokes requires the crankshaft to rotate two revolutions. It should be noted that different engines may use different duty cycles and valve control methods, so the number of strokes of the piston may also vary.