[T3] type 4 2000cc oil pressure and overheating problem

Dave Hall dave at hallvw.clara.co.uk
Sat Dec 10 14:54:11 PST 2011

The later buses had air intakes that bulged a bit like ears.  Certainly the
upright engines were well known for failing at relatively low mileage, but
they are geared down, so do more revs per mile cruising.  We notched a valve
in Germany - maybe shouldn't have used the lowest grade fuel!

UK VW Type 3&4 Club

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of
Bobsnotch at aol.com
Sent: 10 December 2011 15:07
To: type3 at vwtype3.org
Subject: Re: [T3] type 4 2000cc oil pressure and overheating problem

In a message dated 12/10/2011 9:42:34 A.M. Eastern Standard Time,
jadney at vwtype3.org writes:

Also, I  don't understand what it is about the Type 4 intake that provides
"forced  induction." It's been years since I dealt with one, and this is not
an  aspect I paid any attention to, but the Type 4 squareback louvers and
ducting strike me as pretty much the same as those in the Type 3

The notch ducting is a lot more convoluted. Are you under  the impression
that the area behind the notch rear window is a high pressure region? Is
this true? I wouldn't expect this, but I don't know.

I agree. Especially when you look at the bus louvers, and that the lower
half of the engine is sealed in a bus, so it's just drawing in air from all
around the engine compartment (mixed hot and cool air).
If you look at the cooling slots under the rear window of a Notch, you'll
see that area is actually slightly smaller (surface area) than the 2 sides
of a  Square, or Fastback. It's also a low pressure are like the front air
vent (in  front of the windshield), so it's not pressurized. It (a Square)
should actually  have better cooling air intake flow than a Notch. I don't
know IF you've ever  looked inside the Notch cooling ducts before, but
there's actually dams inside  the duct work. I don't know what they do,
other than maybe divert water toward  the drains. But they do stand up to
about 1/2 the duct work. :O 
What makes you think the t-3 fan is 2 stage? I know the belt pulley has
vanes in it, but I've always thought they were to straighten out the air
flow into the large fan.  

Bob 65 Notch  S with sunroof and IRS (Krusty)
71 Notch (Krunchy)
64 T-34 Ghia  (Wolfie)
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