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Probably ought to brush up on that electrical theory a bit. Ohm value of a wire, while it is dependent on length.. and composition, is also dependent on specific gauge, at a predetermined length.....No need to 'double' the turns, when you can use the same amout of turns.. and simply use a thinner wire to get that correct primary resistance. I think you will be very hard pressed to find any modern coil manufacturers that are actually including a resistive element inside the coil case, vs just using some math to determin correct primary length and diameter wire. I suspect you may find some specialty / vintage/or repro stuff that may incorporate a resistive element.. but would believe that to be the exception, not the rule. The coil I posted about, a napa ic14sb, contains no resistive element. It simply has the correct turns and wire diameter for the correct ohm/impeadance value. Plenty of surplus high voltage there, especially when you look at what voltage the spark will jump the gap.. lots of built in 'tolerance' for wear and tear down the road, without loosing sparkies, vs a stock 6v system.... I.e. using the specs for the 6v system, pluigs, and point gaps.. the 12v setup should function better with the same amount of wear and tear on a given stock 6v setup. Where the corrosion and wear may lower the votlage output below a suitable level giving you intermittant missfires and poor spark, the 12v setup will be producing excess (unutilized potential ) and that will come into play inthe form of better spark quality under the same corrosion/wear conditions as a similar 6v setup. Most of theis is determined by spark gap, and compression ratio, and at what potential buildup the spark needs to reach before it will jump the gap. Soundguy
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