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Sal, I've written a lot here about dwell, search under my name for some history. I am working on reverse engineering the old tach circuits for fun and to understand the input signal it's necessary to translate the dwell into a duty cycle.
The reason the automotive world went away from CDI is because even though the charge time is short, the spark duration is also short. Klaus Lattinger (klatinn, inventor of the LM-1) developed a system that would use a capacitor to start the arc then switch to a transformer for a very hot, long burn. This eats the plugs in half the time but a set of plugs is only about $10 for a 911. Anyway, if you have a clean sheet of paper, that is the road I would follow.
Search here and on the Innovate forum for more information.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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