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Automotive glossary: What is a Camshaft or Cam Carrier?

Definition of Camshaft: The task of the camshaft is opening the valves, which normally are closed again by spring force. It is about a revolving axis, with bulges placed in the position of every valve, that push down the valves with the rotation of the camshaft, opening them thereby. Between camshaft and valves there may be other components, usually rocker levers or tappet rods, as with the formerly used, placed below camshafts. With four stroke engines, the camshaft rotates with half the speed of the crankshaft and is driven by the latter through a timing chain, a toothed belt or the like.

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