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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.
1 Under the distributor cap is a rotating unit called the rotor which makes contact between the ignition coil wire and one of the spark plug wires. 2  On models before 1988 there is a hall effect sensor inside the distributor. 3  This is wired to the ignition computer and senses the position of the camshaft.