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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.
Merge this question into. Split and merge into it. Answer by Dorsai. Confidence votes 1.6K. On some engines the cam-shaft does not directly operate the valves, but uses a lever (the Cam Follower) to transmit the force from the cam to the valve. Basically they are levers, and they are used to open the valves.