High Quality Content by WIKIPEDIA articles! In a piston engine, the valve timing is the precise timing of the opening and closing of the valves. In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the camshaft, or it can be varied during engine operation by the relatively new technology of variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance; This variation is normally unwanted.

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