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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.
Cam timing is the relation of the valve timing event to the crankshaft or piston location. As you advance the cam you open and close both intake and exhaust earlier in relation to the crank / piston position.