A four stroke camshaft rotates _________ of crankshaft speed.

In a four-stroke engine, the camshaft is designed to rotate at half the speed of the crankshaft. This relationship is essential due to the operating cycle of the engine. In a four-stroke cycle, the crankshaft completes two revolutions to allow the engine to complete one full cycle of intake, compression, power, and exhaust.

During this process, the camshaft, which is responsible for controlling the opening and closing of the engine's valves, only needs to complete one full revolution for every two revolutions of the crankshaft. This coordinated timing ensures that each valve operates at the correct times in relation to the crankshaft’s position, enabling efficient engine operation.

Understanding this relationship is crucial for diagnosing engine performance and for any work related to the timing mechanisms in four-stroke engines.