How many revolutions of the crankshaft are required to complete a full cycle in a four-stroke engine?

In a four-stroke engine, a complete cycle of operation involves four distinct processes: intake, compression, power (or combustion), and exhaust. Each of these processes requires the crankshaft to make two complete revolutions to ensure that the engine’s piston moves through all four strokes.

To break it down: during the first revolution of the crankshaft, the intake and compression strokes occur. In the second revolution, the power stroke happens first, followed by the exhaust stroke. This means each complete cycle of intake, compression, power, and exhaust occurs with the crankshaft completing two full revolutions. Thus, two revolutions are necessary to complete one full cycle in a four-stroke engine.