I always thought centrifugal advance was 'all in' before 4,500rpm. If
centrifugal advance was all in at, say, 3,000 rpm which would be high,
part-throttle cruising then the vacuum advance should add a few degrees as
Seem to recall the max advance spec was around 35 deg at 3,000-3,500 or so, but
Bob Spidell - San Jose, CA
Does not sound illogical to me as the timing would be accurate in the
power band you are using when driving spirited. At those revs the
mechanical advance system is at max.
Be sure though that the balance weights and springs are in good order
and moving otherwise you may turn up with the wrong timing at low revs.
Mark LaPierre wrote:
> This weekend I was introduced to another way to fine tune the timing on our
> cars but I got to
> the tech session a bit late so I am hoping some one can advise. The theory
> is to run the car
> up to about 4500 RPMs and set the timing at approx. 32 degrees. This can be
> done by using
> a set back timing light since 32 degrees is not obtainable on our car
> I believe the 4500
> RPMs takes the car up to max. advance which gives you a finer timing
> adjustment. That many
> RPMs seemed a bit excessive when you heard the cars revving up big time but
> none of them
> blew up so I guess no harm was done.
> Sorry that my comments here are a little vague but I did walk in at the
> of the tech session so the details are a bit foggy. I would like to try
> this so if any one can enlighten me a little more please do.
> Please correct me or add to what I have already mentioned.
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