Posted by MarkB_MI on July 10, 2016 at 02:09:48 from (70.194.0.55):
In Reply to: Ignition Coil 12 volt posted by gdtractor on July 09, 2016 at 19:48:30:
The thing to understand is that to truly have a "hotter" spark, you need more energy. The amount of energy in a conventional ignition system is determined by the primary inductance of the coil and the current through the coil. Coil current is limited by primary resistance, and in a 12 volt system resistance has to be added to keep the points from burning out. If you replace your original coil with anything other than a "12V no external resistor" coil, you'll need to add an external resistor. Looking at the specs for the Accel 8140, they don't publish the primary inductance, which tells me it's probably the same as stock. So the claims of a hotter spark are probably bogus, since current is fixed by the external resistor and inductance is the same as stock.
There are aftermarket coils with higher-than-stock inductance. But these are really intended for use with aftermarket dual-point distributors. (Do they even make those anymore?)
The fact of the matter is the stock ignition system is totally adequate for the slow speeds at which your H operates. Just install another "12 volt no external resistor" coil and fuhgetaboutit. (The only downside of the "no external resistor" coils is they seem to have a high failure rate, possibly due to heat from the internal resistance and small wire gauge on the primary side.)
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