How many revolutions take place in a two-stroke engine?

In a two-stroke engine, one complete cycle of operation—comprising both the intake and exhaust strokes—occurs in just one revolution of the crankshaft. This is due to the design of the engine, which allows for the completion of both strokes (intake and exhaust) as the piston moves up and down through its stroke. As a result, every time the piston moves down on the power stroke, it completes the necessary functions to intake and expel gases, leading to a power output with only one crankshaft revolution per cycle.

In contrast, a four-stroke engine would require two full revolutions of the crankshaft to complete its cycle of intake, compression, power, and exhaust strokes, emphasizing the efficiency that the two-stroke engine design provides. This distinction highlights the effectiveness of the two-stroke design in producing power more frequently, allowing it to deliver power with a simpler and lighter construction.