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Randy..... .ya gotta under stand sparkies; its called gap ionization potential. Once the sparkie inpulse reaches that voltage, they're gonna JUMP the gap, bang! There are many factors that effect the ionization potential, compression ratio; carb mixture; combustion chamber design; sparkplug tip gap; to name a few. Most are HIGH RPM requirements. Your low rpm low compression flathead engine doesn't meet those specifications, does it? Additionally, ALL ignition systems are "over-designed" for higher sparkies ennyways to compensate for natural wear and tear of ignition system. So lets put some numbers on all this hi-tech sparkie gobble-gook. These are illustrative numbers, not actual specifications, but they're close to real world. A sparkie gap of about 0.025" might take about 10,000 volts to JUMP the gap in yer 6:1 low compression engine. You tractor sparkie coil might be designed for 25,000 volts. Every time the sparkie pulse heads down the ignition wire, when it reaches 10,000 volt, BANG!!! jumps the gap and the extra 15,000 is disapated as waste heat. Notta big deal. Now then after running yer tractor for a year, yer sparkie gap has naturally "eroded" and has surface contamination. Now its gonna take 15,000 volts to jump the wider gap. Notta big deal 'cuz yer ignition system is designed for 25,000 volts ...except... yer ignition points have eroded and has surface contamination too and cuts yer ignition sparkies to 20,000 volts. Now yer gittin' marginal sparkies arn't you? about 5,000 spare sparkie volts, right? See where this is going??? Now assuming you have that HOT-COIL thats rated for 40,000 volts. Will you have enuff spare sparkie volts??? Yah, ya bettcha!!! Probably have enuff spare sparkies for 10yrs of tractoring. So iff'n yer heart is set on a 40,000 volt ignition coil, just understand what that really means and why. Yeah, hotter sparkies makes for faster starting in COLD WEATHER. But that is also why you've already changed to 12-volts. My eazy starting 6-volt 8N with standard ignition coil will jump a 3/8-in gap. Requirement is just 3/16" gap jump. Thats outside yer engine in normal air. Under compression, the 0.025" gap still rules and will sparkle for 10yrs before you need to change sparkplugs..... ...Dell, yer self-appointed sparkie-meister
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