valves. Typical components are listed below in order from the crankshaft to the valves.

Camshaft

The timing and lift profile of the valve opening events are controlled by the camshafts, through use of a carefully shaped lobe on a rotating shaft. The camshaft is driven by the crankshaft and, in the case of a four-stroke engine, rotates at half the speed of the crankshaft.

Motion is transferred from the crankshaft to the camshaft most commonly by a

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