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Re: [T3] Timing/dwell relationship and Pertronix


<x-flowed>At 11:32 PM -0600 1/12/04, Jim Adney wrote:

Nothing happens (sparkwise) when the points close. The spark happens when the points OPEN

Sure, sure...

and it lasts until the stored energy in the coil is exhausted. The
length of time that the spark lasts is generally quite short compared to the
time between opening and closing of the points.

Aha! Got it. :)


Other way around: Increasing the dwell retards the spark. Don't feel bad, I
ALWAYS have to draw myself a picture to figure this out.

D'oh! And I always thought that dwell was the duration of the points being open (that is, the spark 'sparking')! ....er, well sort of.


I think I got that impression from the specs -- they list a range of acceptable point gap (.016" to .020", or something like that) and a range of acceptable dwell angles (forty-something degrees to fifty-something degrees, iirc). I never realized that the numerically SMALLER point gap value corresponded to the numerically LARGER dwell angle measurement!!

-Greg

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