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Published On: Sat, Apr 13th, 2013

✔ Valve timing diagram explained with video

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The valve timing diagram explains the operation of the valves in an engine. This is a very complicated topic, so for your easy understanding we have uploaded a video explaining it.

Theoretically how valves should operate:

The inlet valve should open at top dead center (TDC) and close at bottom dead center (BDC). Similarly that exhaust valve should open instantaneously at bottom dead center (BDC) and remain open till it reaches top dead cent re (TDC), where it must close.

Practical limitations of the theoretical concept:

Due to inertia the valves cannot open instantaneously and also air fuel mixture has its own inertia; consequently more time is required for intake and exhaust process.

Valve timing diagram explained (practical working of valves):

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As shown in figure, the inlet valve is opened about 5 degree before TDC (called valve lead) and closes after about 45 degree to BDC (called valve lag). Likewise the exhaust valve is opened before about 50 degree of BDC and closes after 5 degree to TDC. The condition when both the inlet and exhaust valves are open simultaneously during the crank shaft rotation as show in fig: 1 is called valve over lap.


The above video explains valve timing diagram.

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