Valvetrain
Mechanical system in an internal combustion engine / From Wikipedia, the free encyclopedia
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A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine.[1] The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combustion chamber, while the exhaust valves control the flow of spent exhaust gasses out of the combustion chamber once combustion is completed.[2]