| http://www.w3.org/ns/prov#value | - Posts 3,182 Another thing a lot of people do not think or know about is the intake opening on the crank shaft is only open for a short period of time (see the animation on the link that Double G posted) and he is when the piston is a TDC. And it is the piston coming down that causes the pressure in the crankcase.
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