Camshaft with pushrods- paul-ryan.info Rocker arm Valve Piston Connectingrod Crankshaft sprocket Drive chain Camshaftsprocket Cam Tappet Pushrod
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When the camshaft is mounted in the engine block, long pushrods operate the rocker arms which in turn open the valves. This overhead-valve (OHV) system is less efficient than an overhead camshaft because the number of moving parts limits the speed at which the engine can run safely.

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The engine - how the valves open and close

Engine with overhead camshaft An overhead-cam (OHC) engine needs fewer parts to operate the valv...