The distributor shaft bushing can wear, allowing the rotating part to
wobble. The shaft can actually be bent, causing even more wobble. I don't
know how it happens, but I've seen it. I always wondered how much this
wobble actually affected timing, however, since the rotational speed is the
same, just the arc described by the distributor cam is different. In a
points system, it could affect dwell at the points, and spark even with an
optical unit (due to rotor-to-cap contact variations). But I don't know
about timing per se, in that the total range of variation would be
considerably less than 1 degree, I would think. I guess the question would
be, would that be noticeable in operation? As opposed to looking erratic
with the timing light.
Just speculating...
on 8/31/01 1:49 PM, Larry Colen at lrcar@red4est.com wrote:
> When I last dyno tuned my motor, I noticed that the timing did not
> seem as steady as I'd like it to be. Would the problem likely be in
> the distributor drive gear, the distributor or ... ?
>
> Is there an easy way to check? Especially since I'm about to have my
> motor torn apart again in a short while.
>
> Larry
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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