Thickness Suitable Car Modified Exhaust Elbow Pipe--the effect of valve overlap

The necessity of valve overlap will result in the exhaust process, when the piston is close to the uppermost end, the last exhaust gas is expelled from the exhaust valve, and part of it is pushed out of the intake valve and enters the intake port. (This is also the reason why the idling speed is easy to dirty the throttle). In this way, in the next air intake process, it actually sucked back the last puff of exhaust gas that was squeezed out just now, and then sucked in fresh air.

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