Is RPM Crankshaft Or Camshaft?
Is RPM Crankshaft Or Camshaft? Driven by the crankshaft, the cam spins half as fast. So when the crank is spinning at 3,000 RPM, the cam is spinning at 1,500 RPM. This allows the 4-stroke action to take place inside the engine. Each rotation of the cam provides the opening and closing of the valves.