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Re: effect of PCV valve unplugged from valve cover?
Posted by BobS (more from BobS) on Fri, 21 Nov 2008 21:51:10
In Reply to: Re: effect of PCV valve unplugged from valve cover?, Ari
[Profile/Gallery]
, Fri, 21 Nov 2008 06:28:08
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There is little if any vacumm drawn on the crankcase by the PVC system. The 3 port fitting in the valve cover is open between all ports. Air flow from the small port can easily flow to the large port to the intake tract upstream of the throttle. To test for this, pull the fitting out of the valve cover and place your finger over the crankcase port with the engine running. Feel any vacumm? Any affect on engine operation?
If there is enough vacumm, the crankcase vapors are drawn from the fitting into the intake manifold, or with low vacumm and/or high vapor flow the vapors exit through the larger hose. No vacumm is drawn on the crank case since the crankcase is open to filtered air via the large hose.
When the fitting is not in the valve cover, unfiltered air is drawn into the engine via the orfice and small hose.
posted by 71.221.231...
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