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[[Image:Nockenwelle ani.gif|thumb|320 px|Animation showing rotating cams and cam followers producing reciprocating motion.]] ...forth) motion in the ''follower'' which is a lever making contact with the cam.

...arm with contact points at the left. The pivot is on the right and the cam follower is in the middle of the breaker arm.]] The distributor shaft has a [[cam]] that operates the [[contact breaker]]. Opening the points causes a high [

...e stems with [[cam]]s and [[cam follower]]s. The shape and position of the cam determines the valve lift and when and how quickly (or slowly) the valve is ...ne for the intake and one for exhaust valves, creating the [[dual overhead cam]], or ''DOHC''. The camshaft is driven by the [[crankshaft]] - through gear