[TR] distributor advance

[Jeff Scarbrough]

As I understand it, you are correct.  As the weight swings outward, the
advance increases.  Heavier springs or lighter weights delays the advance;
lighter springs or heavier weights speeds up the advance.

But...

The springs are sometimes loosely mounted (especially in emission-control
distributors?) such that the weight can swing out a tiny bit without being
affected by the spring at all.  Thus, a distributor that holds timing after
TDC at idle can quickly jump ahead a few degrees when the throttle is
cracked open, advancing to before TDC.  The advance curve can then operate
"normally" as the throttle opening (and RPM) increase.  Sometimes you see
two different weights and/or two different springs to cause specific
effects on timing throughout the RPM range.

Jeff Scarbrough
Corrosion Acres, Ga.

On Thu, Mar 5, 2020 at 1:56 AM DAVID MASSEY <dave1massey at cs.com> wrote:

> I may be wrong here but I thought the springs resisted the pull from the
> weights and stiffer springs would make the advance come on more slowly.
>
> Dave
>
>
>
> -----Original Message-----
> From: Peter Arakelian <PeterAra at msn.com>
> To: triumphs at autox.team.net <triumphs at autox.team.net>
> Sent: Sun, Mar 1, 2020 1:39 pm
> Subject: [TR] distributor advance
>
> > Wouldn't stiffer springs give you less advance at idle and, hence, more
> advance at speed?<
>
> That was my initial thought, too.  However, the way the system appears to
> work is that the weights pull out no matter which spring is used.  The
> springs determine how much of that pull is transferred to the distributor’s
> advance.   A stiffer spring will follow the pull of the weight more closely
> giving you advance sooner.  This was also borne out by what actually
> occurred. When I put the stiffer springs in the idle timing advanced by
> 10-15 degrees.
>
>
> Sent from Mail for Windows 10
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