Car engine valves are mechanical components that enable or decrease the flow of gas or liquid back and forth between the combustion chambers or cylinders. Technically, a car engine valve works in the same way as other types of valves.

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Engine valves can restrict or allow fluid flow. The valves in a car’s engine are fully automated and can be synchronized with other engine components like rocker arms to allow them to unlock and lock the engine in the correct order and at the right time. It can also be used for air inoculation, as part of the exhaust gas recirculation and effusion direction operations in cars.

Every cylinder has at least two valves, i.e. an intake valve (intake of fuel/air mixture) and an exit valve (exhaust gases) are two important components of an internal combustion engine. Multi-valve engines can have up to five valves, sometimes three or four. Multi-valve engines are known for their increased efficiency in fuel combustion. With BSIV emission norms in effect, most engine designs now have a four-valve system. Two for intake of fuel and oxygen and two for exhaust gasses.

To ensure that the engine runs efficiently under all conditions, timing is critical for valve opening and closing. Four stroke engines have the intake valve(s), which opens at the beginning of the suction stroke, and the exhaust valves that opens during the exhaust stroke as the piston returns to TDC from BDC. During compression and power strokes, the valves are still closed. Cam-operated opening and closing of valves is possible. Different engines can be distinguished by the position of the valve camshafts (OHV/OHC). OHV (Overhead Valve), an engine design in which the camshaft and valves can be operated via pushrods, lifters and rocker arms. OHC, on the other hand, is where the camshaft and valves are located inside the cylinder head. A DOHC design is used for 4-valve engines.