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Originally Posted by The Radium King
- i can see how vacuum would reduce aeration of the oil, but am uncertain re sealing of piston rings? would sealing of piston rings not best be achived by equal pressure on both sides?
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The rings are seated within the piston so that when the pressure of compression and especially combustion pushes on them, they push harder on the cylinder walls and help to keep pressure from escaping into the crankcase. The little amount of vacuum from the ventilation system has a small additional sealing effect.