[T3] odd issue RPM hangs.

[William Jahn]

I took the dist out checked the springs all good there. I lubed the weights
again and the trigger cam and installed the condenser just in case. Put a
replacement working vacuum can on it yet still have the vacuum line
plugged. I warmed it up and played with the timing set it right to 5 BTDC @
850 RPM and 1000 it does return to where I set it yet why the ping?  It
still pinged pushing it which it didn't do before so I set it a bit below 5
BTDC . Haven't driven it after , this just makes no sense. I know when the
RPM was below 850 it was @ 7.5 degrees BTDC unless I was looking at it
wrong never had this issue before.

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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