Detours,
Nevermind, I re-read your post and all is clear!
Quote:
Originally Posted by detours
...
As the piston moves up and down, it creates alternating positive and negative pressure in the crankcase. When the piston comes down, positive pressure helps push fuel and water vapor out of the crankcase. When it goes back up, negative pressure sucks some of that vapor back in....
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jb