> I thought that the Pertronix was just a stupid switch and
> the dizzy springs/weights controlled the advance.
I believe the Pertronix unit is just a (very) stupid switch. The newer
Crane might be a bit smarter, ISTR reading that it adjusts dwell time based
on engine rpm to optimize high rpm spark without overheating the coil at
lower rpm.
But AFAIK none of the common conversions does anything about adjusting spark
timing, except to hopefully reduce the effects of shaft wobble (due to a
worn out distributor) and eliminate timing/dwell changes due to wear of the
rubbing block on points. There are systems that do adjust spark timing, but
as Joe notes, they are generally much more expensive and usually involve a
crank trigger to derive timing.
-- Randall
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