[T3] Diagnosis help for a badly running 1971 VW 411

Dave Hall dave at hallvw.clara.co.uk
Wed Aug 14 10:35:17 PDT 2019

The Type 1 engine works fine in a Type 2, but has to have different tinware and a foam seal to make sure the cooling air can't mix with the spent (warm) air.  I assume the bigger engines work just the same. In 1972 the cooling air intakes were enlarged, replacing the pretty crescent-shaped ones.  They do act as scoops   I don't think there's any  internal trunking in Bay window Type 2s.  I don't know about the Type 25, but they moved to the water-cooled heads on an enlarged capacity Type 1 quite soon in that model.

UK VW Type 3 and 4 Club.

-----Original Message-----
From: "Jim Adney" <jadney at vwtype3.org>
Sent: ‎14/‎08/‎2019 16:17
To: "type3 at vwtype3.org" <type3 at vwtype3.org>
Subject: Re: [T3] Diagnosis help for a badly running 1971 VW 411

On 13 Aug 2019 at 21:18, Dave Hall wrote:

> The Type 3 dual carb engine overproduction has definitely been confirmed
> as being used mainly in the Type 2.  It was also used as an industrial
> engine. 

I can definitely see this as an industrial engine, but I have trouble seeing 
how to fit one in a bus. I'm giving away my ignorance about buses, but it 
seems like getting the cooling air to the engine would require a complete 
redesign of the rear of the bus. Maybe VW did this redesign for '72, when we 
know they managed to stuff the Type 4 engine in there.

Which brings up the question: What did VW have to do to the bus body to 
get cooling air into the Type 4 engine? Did they have to lengthen the body or 
just shorten that shelf behind the engine? Did they make airducts in the body 
or just seal the engine, top from bottom, and let the engine suck from the air 

Whatever they did, this would have been a different engine than what was 
produced for Type 3s. I'd expect it to get a different engine prefix. Same for 
industrial engines.

I guess I don't know how they did this for Type 1 industrial engines.

BTW, when my daughter was young, she figure skated, and one day when 
we were at the local ice rink, I managed to talk to the Zamboni driver after he 
refinished the ice. Turns out that this was an OLD Zamboni, and the engine 
in it was a VW Type 1 engine. The Zamboni at the rink on the other side of 
town was newer and had a Rabbit engine. Small World.  ;-)

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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