VERY INTERESTING for us sparkies at least. You likely already know all this JD but for others benefits I will just toss this out from an engineeres perspective.......
Sellers hype all this crap about their HIGH VOLTAGE COILS butttttttttt the coil only rises high enough in voltage until curent can arc jump the plugs gap AND NO HIGHER. When the magnetic field collapses and high voltage is induced over into the HV secondary it ramps up BUT ONLY UNTIL ITS HIGH ENOUGH SO THE PLUG FIRES AND NO HIGHER. (HV coil dont necessaruly fire at their advertised 40,000 volts, its just that they CAN achieve 40,000 if necessary but it only rises high enough to fire the plug NO HIGHER)
The voltage it takes to arc jump current across the gap is a function of 1) the gap distance and 2) the medium (fuel and compression) in which it fires
Sooooooooo all things being equal (plug gap and compression) the HIGH VOLTAGE COIL will fire at about the same voltage as the stock coil (subject to minor inefficiency or magnetic field differences from better magnetic materials etc)
HOWEVER the thing is the HV coil has THE CAPACITY to rise to higher voltage (then the stock may have) if necessary like if the gap is increased dramatically OR the compression is much higher. If youre running exotic fuels and at very high compression the voltage has to rise higher before the plug fires so the HV coil has the capacity to achieve higher (if necessary) voltages.
Next, if mechanical points have to switch much higher then 4 or 5 amps they burn up sooner sooooooooo the elec switch can be better cuz it can switch higher currents (if so rated) and it provides a fast positive switching without the condensor and ringing and point bounce ect.
If the coil is only 1.5 ohms and theres no ballast on a 12 v system the points would have to switch 12/1.5 = 8 amps and that will burn the points sooooooooo if the elec switch is rated 8 amps it works but if rated less it can only switch its rating (why may still need a ballast even with elec switch if its only rated 4 amps)
BOTTOM LINES:
The stock coil can likely (unless compression is way higherand plug gap is increased dramatically) rise to high enough voltage with points or elec switch. The HV coil wont fire any higher then the stock if all else is equal (but it can if necessary remember)
BUT HERES WHY THE MATCHING OF A HIGH ENERGY COIL AND AN ELEC SWITCH (capable of passing and switching more current then points) CAN IMPORVE PERFORMANCE
Okay if you store more energy (volts x amps x time) becasue you pump more current into a higher energy coil during the conduction cycle THAT MEANS YOU HAVE MORE ENERGY (volts x amps x time) TO DISCHARGE ACROSS THE PLUGS GAP WHEN IT FIRES. And if you run a wider plug gap (HV coil can handle) and if you discharge more energy (volts x amps x time) across that wider gap when the plug fires THAT CAN IMPROVE PERFORMANCE especially if youre running at higher compression.
I been retired as an electrical engineer for yearsssssssssssss but Im pretty sutre this is all sound. Im NOT saying elec switch will add much if any HP mind you Im ONLY sayingif you run high compression and a wider gap the stock ignition may not perfrom as well as if you match an elec switch with a high energy HV coil at a wider gap in which case FOR SURE you do discharge more energy (volts x amps x time) across the plug gap when it fires and most report improved starting and idling when they do so
John T Too long retired EE but love this sparky chat
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