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

Bobsnotch at aol.com Bobsnotch at aol.com
Sat Dec 10 07:07:15 PST 2011

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  squareback.

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  

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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