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Old 09-01-2009   #17
flyin ryan
 
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Join Date: Aug 2006
Location: Edmonton, Alberta or Phoenix, Arizona
Posts: 2,736
Default Re: Cam Cover Foam Filters

In reality, fumes 'Do' go out the tube to the throttle body. Almost like the way a venturi will 'Draw' on a tube or booster. It's well docmented the problems Lotus had with crank-case pressure, they had too much, to think that fresh atmospheric air some how finds it's way into the tube connected to the cam covers, going against the grain per sa, is wishful thinking. Remember the 70's early 80's Sm. Blk. Chev.'s that had a tube going from one of the valve covers to the air cleaner base? Same idea...That tube we are talking about has the ability to draw fresh air, but the reality is something different.
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