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A moving part in a machine which transmits motion in a straight line between a cam and another part.
- ‘The 16-valve has twin, chain-driven, overhead camshafts and hydraulic tappets, while the 8-valve format uses a single camshaft.’
- ‘Very small roller cam followers are installed in the cylinder head to operate the valves instead of the conventional bucket-type tappets, and here friction is cut by about 70 per cent.’
- ‘The real breakthrough in lifter design for street and moderate competition applications was the marriage of roller tappets with hydraulic lifters.’
- ‘The barrier valve furthermore has a tappet, which engages the support body and is movable relative to the armature and carries a closing body of a seat valve.’
- ‘Contact between the cams and the tappets in the valve train span the mixed and boundary regions.’
Mid 18th century: apparently an irregular diminutive of tap.
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