Re: [T3] 74 SB w/ IV engine

[Jens Vagelpohl <jens@type4.org>]

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On Mar 1, 2005, at 5:03, Jim Adney wrote:

> On 28 Feb 2005 at 13:47, Jim Showker wrote:
>
> > I'm interested in the air bellows setup you mention.  Where do I find 
> > such a
> > thing, you kow, what year and kind of car is it on?
>
> Some type 4s came with the bellows.

All 411/412 models had bellows.

The wagon version points straight backwards to an opening in the body. 
The cavity there gets air from the side of the car through the air 
intake louvers.

On the sedans the intake is pointing upwards. The bellows terminate in 
a plastic plenum that connects to the engine lid when the lid is closed 
and gets air through the louvers in the lid.

The bellows for sedan and wagon are different. On the wagon, it is a 
little funnel-shaped, it gets wider towards the top. On the wagon the 
diameter is very similar on both ends.

What this means, in essence, is that cooling air intake always happened 
from the outside. No cooling air was drawn directly from the engine 
compartment. At that point the question whether to seal the top half of 
the engine from the bottom half becomes less important.

On my 1974 412 wagon the top half is sealed off. There is a foam rubber 
seal all the way around, even though every single "consumer" of fresh 
air (cooling fan, fuel injection, heater booster fan) is sealed off 
from the engine compartment itself. I don't have a sedan to look at, 
but the parts book shows this foam rubber engine compartment seal for 
all models, so I assuming the situation is the same on sedans, meaning 
they are sealed as well.

jens

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