[T3] cylinder head breather ports on a 1972 Squareback

[Jacob Adam Schroeder]

If by having the intake portion correct, you mean the hose between the oil
breather and the IAD, then yes, I have that connected.

Should I try using those valve covers they sell with the valve/port in them
for ventilation?  This would be easier than swapping out a set of heads
(assuming I did not just want to live with it as is).  Thoughts? Any
experience with those valve covers?

Jacob

On Saturday, August 3, 2013, Jim Adney wrote:

> On 3 Aug 2013 at 20:00, Dave Pallo wrote:
>
> > [[[I think you'll be okay if you plug the extra holes in the air cleaner
> and
> > just run it this way. With the original setup, this would draw clean air
> > into the heads and flush out the case, keeping condensation to a minimum.
> > This would be especially useful in cold weather.]]]
> >
> > I don't understand this, Jim. If his pcv is drawing air out of the
> > crankcase, the air has to be replaced, right?
>
> Without fresh air getting into the case, there will be a bit of a
> vacuum in his case, much of which will be alleviated by blowby and
> vapor from any gas in the oil. This should not cause any problems.
>
> > When I first got my '72 up and running, I too did not have the ports in
> the
> > heads and I installed brake line sized ports in the valve covers to allow
> > air in. I was flinging oil out the fan end of the motor at the time, and
> > this list told me I needed larger air ports to let more air into the
> case. I
> > didn't understand why, but I then installed about .500 diameter ports
> into
> > the valve covers and my flinging oil problem was solved.
>
> The situation you describe occurs when you don't have the breather
> ports in the heads AND you don't have the IAD suction applied to the
> breather. In this situation, you will get pressure buildup in the
> case from accumulated blowby. A pressurized case will cause oil to
> get blown out of the unsealed rear crank hole.
>
> I'm assuming that he has the intake portion of his '72 system intact.
> If I'm wrong about that, then this changes everything.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org <javascript:;>
> Madison, Wisconsin, USA
> *******************************
>
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