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Re: [T3] Aux air regulator?


Some later automatics had an AAR that was electrically heated, rather
than rely on engine temp to close the AAR. This AAR mounts in about
the same place as the engine temp operated AAR. I think this is only
50 state '73s with autos ('72 autos in california)

Correct me if I'm wrong, but this is the breather system as I understand it:

The crankcase breather system (well, at least in the case of my '73)
draws air in to the crankcase through the black breather box on the
top of the fan shroud (where on a Type 1 the generator stand would be)
and air is pulled out via the cylinder hears back into the air
cleaner, to be burned in the intake. There is no PCV valve per-se in
this system as far as I can tell, but there is a state of positive
pressure in the crankcase that causes hydrocarbon vapors to be
reburned in the intake.


On Thu, 20 Jan 2005 22:16:19 -0600, Jim Adney <jadney@vwtype3.org> wrote:
> On 20 Jan 2005 at 20:54, Dave Pallo wrote:
> 
> > What does the aux air regulator do for the crankcase vent system?...best I
> > can tell, it's a pcv valve?.....it allows crankcase air (and fumes) to get
> > sucked into the air intake distributor for burning, and it also allows
> > clean air to be drawn in (from air cleaner via a braided hose) to replace
> > the air drawn out, correct??
> 
> The AAR doesn't do anything with crankcase gasses. It simply admits extra air
> to boost the RPMs when the engine is cold. Sort of an automatic throttle.
> 
> > then what is the function of the black crankcase vent box located next
> > to the blower housing, which also has a braided hose?
> 
> That's the crankcase breather. Crankcase gasses leave the case there. Where
> they go after that depends on the year.
> 
> --
> *******************************
> Jim Adney, jadney@vwtype3.org
> Madison, Wisconsin, USA
> *******************************
> 
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