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A camshaft is the element of an internal combustion engine the purpose of which is to open and close the valves.orking in conjunction with the crankshaft, the camshaft rotates at half the speed of the crankshaft in a 4-stroke engine cycle and at the same speed in a 2-stroke engine.
Throughout the four-stroke cycle, the camshaft spins once and the crankshaft rotates twice. The relationship between the rotation of the camshaft and crankshaft is whatâs known as âmechanical timing.â Itâs what controls the movement of the pistons and valves inside your engine cylinders.