Engine valves are mechanical components used in internal combustion engines to allow or restrict the flow of fluid or gas to and from the combustion chambers or cylinders during engine operation. ... More information concerning other about other valve types may be found in our related guide Understanding Valves.
How do valves work in a engine? In theory, the valve operation is very simple: the cam pushes the valves down into the cylinder against the spring, opening the valve so gases can flow and then lets the valve shut under the force of the spring. The pressure in the combustion chamber rather neatly helps seal the valve shut.
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