[T3] Huston, we have ignition! (was RE: Some Spark but no Fire (was RE:Updatewith a Bowl Full of Rust Flakes))

Dave Hall dave at hallvw.clara.co.uk
Wed Jul 27 16:25:10 PDT 2011

Oddly enough, with the twin carb twin vac distributor they say leave both
hoses attached, but that one is timed at TDC. I guess that would be the 7.5
deg of retard, while on the FI '72 you pull off the hose and time it on the
7.5deg BTDC mark, just as you do statically on the old Beetle.  It all makes
perfect sense now.

Odd they only used the dual vac on the twin carb for '71 model year, and
only on the FI for '72 model year.  I'd love to know why.  The dual vac
units haven't the same part numbers for twin carb and FI, but I've not
compared them to see what changed.

UK VW Type 3&4 Club

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: 27 July 2011 19:46
To: type3 at vwtype3.org
Subject: Re: [T3] Huston,we have ignition! (was RE: Some Spark but no Fire
(was RE:Updatewith a Bowl Full of Rust Flakes))

On 27 Jul 2011 at 18:07, Dave Hall wrote:

> Oops!  The VW timing info says to time it dynamically at TDC with the 
> vac pipe OFF for that earlier FI engine.  Does the pipe off make much 
> difference?  If the pipe is left on, will that show some advance or 
> does it come in later on?

Hose on or off makes no difference at idle on these cars. That's true for
the advance hose on all FI Type 3 engines. It's not true for the retard
hose, if your engine has one.

> I guess it's just coincidence that I have dual vac on both my 71 twin 
> carb and 72 FI.

Right, we got the vac retard only in '72.

> Anyway, sticking to the factory method has got to be right.  The last 
> VW engine I timed statically was on the '59 Beetle, when no-one had a 
> strobe light anyway!

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

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