Moottoriventtiilejä

Moottoriventtiilejä, commonly known as engine valves, are critical components in internal combustion engines. They regulate the flow of the fuel-air mixture into the combustion chamber and the exhaust gases out of it. Typically, an engine has at least two valves per cylinder: an intake valve and an exhaust valve. Some engines, particularly high-performance ones, may have more, such as four valves per cylinder (two intake, two exhaust) or even five valves.

The intake valve opens to allow the fuel-air mixture to enter the cylinder during the intake stroke. The exhaust valve opens to permit the burnt gases to exit the cylinder during the exhaust stroke. Both valves are precisely timed to open and close at specific points in the engine's cycle, which is controlled by the camshaft.

Engine valves are generally made from steel alloys that can withstand high temperatures and pressures. The head of the valve is designed to seal tightly against the valve seat within the cylinder head, preventing leakage. The stem of the valve slides within a valve guide, and its movement is actuated by the camshaft, often through a rocker arm or directly. Wear on the valve or valve seat can lead to compression loss and reduced engine performance. Regular maintenance and proper engine operation are essential for the longevity of these components.