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Camshaft with pushrods

Camshaft with pushrods Rocker arm Valve Piston Connecting rod Crankshaft sprocket Drive chain Camshaft sprocket 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.

Explained in

    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 spent gases escape is the exhaust valve. They are designed to open and close at precise moments, to allow the engine to run efficiently at all speeds. Read more

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