[T3] odd issue RPM hangs.

[William Jahn]

Jim , on the mechanical advance how did you come up with 21 degrees total.
I only have the Bentley yet it shows 6 degrees yet this is dist speed on a
machine so you double dist speed . I see the 72 dist chart dist installed
and it's near 21 degrees and has no graph . This means to me you can't
double the RPM and come up with 12 degrees. Or do you have another source
you get the full advance or is this what you have checked with a light and
recorded? I assume total being control in degrees dist shaft begins when
the advance first kinks in at RPM  not from the set 5 * BTDC or are you
just talking about 21 degrees is as far as the mechanical advance should
reach?:

On Thu, Oct 10, 2019 at 1:44 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 10 Oct 2019 at 11:12, William Jahn wrote:
>
> > I've adjusted the MPS and it does run better. Yesterday I decided to
> check
> > the timing. I lowered the RPM then checked it was 7.5 *BTDC it should be
> 5.
> > I backed it off to 5.
>
> On your late pulley, that is the 3rd timing mark from the left, correct?
>
> >  I can't tell what the issue is why the idle hangs and even when set @
> 7.5*
> > BTDC it didn't ping . I rebuilt this dist it had no wear and I lubed
> every
> > thing well and it worked fine. If it had a broken spring it would advance
> > far to much.
>
> The total amount of mech advance for a '73 is ~21 crankshaft degrees.
> That's a limit that's built into the shaft parts. If you had a broken
> spring, it
> would advance faster and get to the max advance at a lower rpm, but you
> would not get any more advance.
>
> In fact, if you had a broken spring, you might be working your way up the
> advance curve even at idle, so that there would be less than 21 additional
> degrees available.
>
> It might be worth looking inside your distributor to make sure that both
> springs are still there. It's unlikely that one has broken, as I've never
> seen
> that happen, but could one end have come off?
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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