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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.
Â­Â­Generally, engines with dual overhead camshafts (DOHC) are higher performance engines, they produce more power, and can run at higher speÂ­eds. The camshafts have the job of opening the valves that let air into and exhaust out of the engine.