How many complete revolutions of the crankshaft are required for a two-stroke engine?

In a two-stroke engine, the power cycle is completed with every revolution of the crankshaft. This means that the intake and exhaust processes occur simultaneously and are managed within two strokes of the piston, or one crankshaft revolution.

During the first half of the revolution, the piston moves upwards, compressing the air-fuel mixture in the combustion chamber while simultaneously allowing exhaust gases to escape through ports. As the piston reaches the top of its stroke, the fuel-air mixture ignites, and the downward stroke pushes the piston back down, completing the power stroke.

Thus, only one complete revolution of the crankshaft is necessary to accomplish the full cycle of intake, compression, power, and exhaust in a two-stroke engine. This design allows for a greater power output relative to size, making two-stroke engines popular in applications like chainsaws and dirt bikes.