How many crankshaft rotations are needed to complete all four strokes of a four stroke engine?

In a four-stroke engine, the operation consists of four distinct phases: intake, compression, power, and exhaust. Each of these strokes requires one complete rotation of the crankshaft for the engine to function properly.

However, it is essential to understand that each crankshaft rotation allows for two of these strokes to occur simultaneously due to the design of the engine. Specifically, during the first rotation, the intake and compression strokes happen, while the second rotation completes the power stroke and exhaust stroke.

Therefore, to complete all four strokes (intake, compression, power, and exhaust), the crankshaft must rotate two full times, resulting in the necessary movements to draw in air and fuel, compress it, produce power, and expel exhaust. This two-rotation cycle is fundamental to how a four-stroke engine operates efficiently.