[FC] PCV/vent tube/balance tube

[Ron]

The PCV valve is just that, a valve and not an open tube that allows a large 
air flow.  It maintains a positive pressure in the crankcase, as it's name 
implies, and they work just fine.  Just use it and don't worry about it.  If 
in doubt, replace it, they're cheap.
RonH

----- Original Message ----- 
From: "Bruce Gwyther" <vairman@sisna.com>
To: <corvanatics@corvair.org>
Sent: Wednesday, February 02, 2005 11:52 AM
Subject: [FC] PCV/vent tube/balance tube


> I'm confused!!  Some 'Vairs use road draft tubes ('60,'61), some use PCV
> valves ( I believe '62,'63), some use metered orfice balance tubes (I 
> believe
> '64 and later). All FC's I've seen have PCV valves. The Original PCV valve 
> is
> a cv584c according to the parts book. My problem is that if installed the 
> way
> indicated (small end towards balance tube-large end towards crankcase vent
> tube), it would introduce large amounts of air into the vacuum system. Air
> from the crankcase or air cleaner would pass through the valve straight to 
> the
> balance tube and into the vacuum ports on the heads. With no metering, as 
> with
> the metered orfice tubes, the large amounts of air would cause a lean
> condition. Can someone straighten me out on this problem (at least a 
> problem
> for me)??
>
>            Bruce Gwyther - - -  vairman@sisna.com
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