| Valve Timing |
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| CATEGORIES ABOUT VALVE TIMING | |
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In Four-stroke Cycle engines and some Two-stroke Cycle engines, the valve timing is controlled by the Camshaft . It can be varied by modifying the camshaft, or it can be varied during engine operation by the relatively new technology of Variable Valve Timing . It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance; This variation is normally unwanted. Many Two-stroke Cycle and all Wankel Engine s do not have a camshaft or valves, and the port timing can only be varied by machining the Port s. Some Supercharged two-stroke Diesel engines do however have a Cylinder Head and camshaft similar to a four-stroke cycle engine. In a Steam Engine , the control of the valve timing is an important part of the operation of the engine. See Valve Gear , and also Walschaerts Valve Gear , Berry Accelerator Valve Gear , Baker Valve Gear , Woolf Valve Gear , Caprotti Valve Gear , Corliss Valve Gear . SEE ALSO EXTERNAL LINKS
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