Actually it is not quite that easy. When the crank of, for example, a four
stroke four cylinder engine has turned through 90 degrees the piston moving
up will not move as far as the one travelling down because of the angles of
the conrods (it forms the hypotenuse of a triangle). The shorter the rod
relative to the engine's stroke, the more extreme this will be. So there
will be a pressure pulse every quarter turn of the crank. Whether this needs
venting (or more to the point whether it can be vented) is another question.
Neil
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