Animated Engines

[Rider]

Originally Posted by TIGGER

Hmmm... well not if the valve is one way, so to speak... although I must confess to wonderin what keeps it seated until vacuum opens it? The pressure of the exhaust gasses until they are released?

But see it would work more like a 2 stroke at that point. Intake, exhaust, intake exhaust. Where is your compression and power stroke (both valves closed)? Seems like the power stroke would open the intake valve and blow the exhaust out.