Dwayne----For years, auto engines ran with their crankcase venting to
atmosphere. The way the vent pipe was shaped and placed allowed air
passing under the engine to assist this venting.
Today, this is sort venting puts one in the class of "outlaw motorist".
It's not difficult to vent the crankcase from the valve cover (or former
fuel pump opening) to a port that goes into the air intake. This port
will have to be fabricated, of course, and the engine fumes can be
directed thru a hose and consumed by the running engine. Crankcase
pressure does the job, without vacuum assist.
Note: Having intake manifold or direct carburetor vacuum pulling on the
valve cover vent tube can cause excessive oil consumption!
The carbon canister setup is still the best for emission control
purposes.
Dick
From:
dc_bruin@hotmail.com(Dwayne Cooper) Date: Fri, May 27, 2005, 9:45am
To: 6pack@autox.team.net Subject: More on Oil leak/SU's -- Valve Cover
Venting Question
I have a 74 with no carbon cannister and I have a hose running off of
the valve cover vent so that it vents under the car. I thought I saw a
picture of a car recently where the valve cover vent tube was hooked up
more or less directly into the back of the two carbs.
Is anyone else out there doing this (running the crankcase vent directly
to the carbs)?
Is there any downside?
Thanks,
Dwayne
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