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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.
DOHC is a type of engine/cam design DOHC means Double Over Head Cam (where two Cams placed over head operate the various valves both intake and out take/exhaust valves). Now there are 2 camshafts per header.