Vacuum.SO CLOSE!
I'm going to be tied up this evening, so, the answer is:
Mechanical advantage. Leverage would also have been acceptable.
Several of you described it perfectly correctly, and for all the right reasons.
Anyone want another one? OK. And it is related to the preceding question:
It is well known that in most modern reciprocating engines, the exhaust valve is almost always opened well before the piston hits BDC. If there is still pressure in the cylinder (and there is!), WHY do they open the valve and let the pressure escape before the piston has reached the end of its travel to BDC?
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