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Saturday 19 April 2014 • 06:52 GMT • Last update 16:46


Valve gear or valvetrain is the system which opens and closes the valves. Conventionally this is controlled by a camshaft, with motion transferred to the valves by tappets and (sometimes) rockers and pushrods.

Camless valvetrains are now being developed which operate the valves using electro-hydraulic or electro-pneumatic systems.

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