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Engine Valve

Engine valves open and close mechanically to admit air or expel exhaust gases into the engine cylinder(s); the valves are placed in the engine's head casting. The valve seat is the place where the valve seals against the head. Most medium-sized IC engines have either intake ports and exhaust valves, or both intake and exhaust valves. Intake and exhaust ports, rather than valves, are used in smaller two-stroke petrol/gasoline engines. Fresh air (intake) valves are larger than exhaust valves, ensuring that when the cylinder is refilled, fresh air replaces as much of the exhaust gases as possible within the combustion region.


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