Camshaft with pushrods- Rocker arm Valve Piston Connectingrod Crankshaft sprocket Drive chain Camshaftsprocket Cam Tappet Pushrod

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

The valve which allows mixture into the cylinder is the inlet valve; the one through which the s...