Quote:
Originally Posted by redmodelt
Rings are not a perfect seal even less so when worn. Pistons goes up, pull air in thru the vent tube, pistons go down push air out thru the vent tube.
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With 2 pistons going up and 2 going down, the overall volume of the sump doesn't change. Any gasses exiting from the breather are purely the result of blowby, which as has been said, is inevitable.