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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.
These DOHC engines usually have 4 valves. One camshaft for the exhaust valves and the other for the intake valves. SOHC means Single Over Head Cam (Only a single cam rod operates the intake and out take valves). That means that there is only one camshaft per header. Inline engines will contain one camshaft.