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Thursday 17 April 2014 • 19:06 GMT • Last update 16:46

Valve gear

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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