In a piston engine, the valve timing is the precise timing of the opening and closing of the valves. In an internal combustion engine these are usually poppet valves and in a steam engine they are usually slide valves or piston valves. ==Internal combustion engines== ===Camshaft=== In four-stroke cycle engines and some two-stroke cycle engines, th...
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http://en.wikipedia.org/wiki/Valve_timing
(from the article `gasoline engine`) All four valve events—inlet opening, inlet closing, exhaust opening, and exhaust closing—are accordingly displaced appreciably from the top and ...
Found on
http://www.britannica.com/eb/a-z/v/5
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