I understand the concept of saturation and collapse. And yes, I suspect it's done better/faster/cleaner electronically rather then mechanically.
That being said - I suspect there is not a huge difference when points are in good shape.
I do know that a clean spark plug in free air gapped at .030" can fire at 10,000 volts. When inside a combustion chamber in a compressed air-fuel mix and cold it can take near 30,000 volts. If fouled it might take 40,000 volts.
Just any car or truck with factory breakerless ignition can easily make 40,000 volts. My 1960 Deere 1010 with the 1.5 ohm coil when in resistor-bypass mode for cranking can make 30,000 volts. But a Pertonix with a 3 ohm coil?? I don't know. They DO claim 40,000 volt potential IF, and only IF you buy their special Flamethrower coil which is still 3 ohms.
The fact is - I really don't know and they provide very little tech info. Pertonix DOES make other systems e.g. the Ignitor II or III that do use low ohm coils. They however are not offered for many of the older tractors.
From a more simple point of view - why did car makers use more substantial equipment back when breakerless first came out and computers weren't being used? Usually a reluctor wheel, pickup assembly (Hall Effect or photo-sensor) and a substantial control box. No such thing with the Pertonix.
Again - I don't really know and Pertonix gives very little tech info. I DO know - according the what I've read with tractor pullers - they do NOT use Pertonix and tend to make their own systems from common auto parts. The 90s Chrysler and Ford systems preferred.
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