[T3] 66 Squareback Now Mine

Dave Hall dave at hallvw.clara.co.uk
Fri Nov 6 10:42:08 PST 2015


I wonder why the USA cars had that (emissions probably) - it certainly does
sound over-complicated!  My UK '72 FI Fastback has the dual vac distributor
connected with two hoses, one green and one grey - in fact the '71-on twin
carb marketed in the UK (and probably most places in the world apart from
the USA and Canada) also has a dual vac distributor, though they are
different of course, due to the trigger contacts in the FI.  The timing
procedure is different for each, too.

Dave
UK VW Type 3&4 Club
===================

-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Jim Adney
Sent: 06 November 2015 15:57
To: type3 at vwtype3.org
Subject: Re: [T3] 66 Squareback Now Mine

On 6 Nov 2015 at 3:41, Soren Jacobsen wrote:

> On 05/26 07:52, Jim Adney wrote:
> > 
> > I can probably come up with a Type 3 hockey stick if anyone needs 
> > one, but note that '72 cars with vacuum adv/retard got a special one.
> > I won't have one of those.
> 
> (catching up on ancient email...)
> 
> Really?  My parts books don't have updates through the very end of the 
> line, but they do have some 1972 info.  I see two hockey sticks, one 
> used through VIN 433785, May 1964 (113 311 541A) and one after that 
> (311
> 311 541).  I do see a different nose cone being used in 1972, though.
> I've never had any exposure to 1970s T3s -- what was different in 1972?

'72 FI Type 3s came with a distributor that had both vacuum advance AND
vacuum retard. As delivered from the factory, the vacuum advance was only
enabled in 4th gear. To do this, there was an extra switch on the tranny
nosecone that was activated by an additional cam on the hockey stick. That
sent power to a solenoid valve in the vacuum line, which let vacuum thru
only when energized.

I always felt that it was overly complicated, so I generally just plumb the
vacuum advance hose directly to the distributor, enabling the vacuum advance
in all gears. Given how the vacuum advance works, it's only likely to come
into play in 4th anyway.

Probably the only reason I know all this is because I once owned one of
these cars. It's a messy system, so if you have one of them, you're really
better off converting it to a stock '73 system. This requires replacing the
distributor, the brain, and the pressure sensor. You can do all that for
about the same cost as replacing the
'72 vacuum can, which was a failure-prone part.

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

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