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Valve Train and Timing

Valve Train and Timing. Valve Train. The valves are typically operated by a camshaft rotating at half the speed of the crankshaft . It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke.

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Valve Train and Timing

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  1. Valve Train and Timing

  2. Valve Train • The valves are typically operated by a camshaft rotating at half the speed of the crankshaft. • It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke. • A tappet between valve and cam is a contact surface on which the cam slides to open the valve. • In our engines, the camshaft is in the crankcase, in which case each cam contacts a push rod, which contacts a rocker arm which opens a valve.

  3. Valve operation http://www.compgoparts.com/TechnicalResources/FourStrokeEngineBasics.asp http://www.youtube.com/watch?v=uB2cmkWbCMI

  4. Valve Terms • head • stem • margin • seat • face • cam • cam shaft • cam lobe • crankcase breather • retaining pins • collars

  5. Valve Tools • valve spring compressors • valve grinders • dial caliper • feeler gauge

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