Scott-
If you're going to have the problem with the vent going to the air filter
then you'll have the problem with a PCV valve in the vent line going to the
air filter. At higher vacuum the PCV valve will close off a little
essentially keeping somewhat of a constant vacuum on the valve cover vent.
The purpose is so that it doesn't draw too much vent gasses at high vacuum
and mess up the air/fuel ratio in the carburetor. For whatever reason, some
engines seem to need to have a strong vacuum on the valve cover vent to keep
pressure from building and pushing oil out the dipstick so routing the vent
to the inlet manifold taps into a lower pressure (higher vacuum), while some
people report no problem with routing the valve cover vent to the air filter
where there is almost no vacuum.
The original Zenith Stromberg carb had a valve cover vent line that went to
the carburetor with no PCV valve. If there is more vacuum with the Weber
than there is more potential for drawing too much vent vapors and messing up
the ratio so the PCV valve is kind of like insurance in my mind. Had I
still had the oil leak problem I would have removed the PCV valve to get
even more vacuum on the valve. cover vent.
Bob
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Date: Wed, 9 May 2001 01:11:52 EDT
From: HD883HUGGR@aol.com
Subject: Re: Weber DGV venting the crankcase.
Bob & Vic (and now Tim): Just to air the thread for the masses: I've been
following your stories, and as you know I also suffer(ed) from excessive
crankcase pressure. I just installed a PCV valve where a straight hose used
to be: connecting VC to air cleaner. I've not put any miles on Hobbs since
the installation due to work (dumb concept, but necessary to finance the
toys), but wonder if the PCV valve into the intake (as opposed to into the
air cleaner) will have the same positive results. Any suggestions?
Scott
Hobbs, 77 Spit, daily driver
Rufio, 75 Spit, drivebable but prepping for to resoration
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