Ram (technology)

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Tappet, Ford engine.

The tappet is part of the valve control of a four-stroke reciprocating engine . It transmits, either together with the bumper and rocker arm or directly, the correct timing of the opening process of the combustion chamber from the camshaft to the valve and keeps the valve stem or the bumper free from forces acting on the side. Tappets have different designs, for example they are hollow as bucket tappets or can contain automatic lash adjuster devices as hydraulic tappets . Roller tappets carry a roller that rolls on the cam, which reduces friction.

Instead plungers also be tilting or rocker arms used.


  • Max Bohner, Richard Fischer, Rolf Gscheidle: Expertise in automotive technology. 27th edition, Verlag Europa-Lehrmittel, Haan-Gruiten, 2001, ISBN 3-8085-2067-1