Thanks guys very instructive, but still have some questions :
My old no name coil as "12V" stamped on it along with this: "EXTERNAL RESISTOR REQUIRED".
I did checked it with my multimeter and it has exactly 1.5 Ohms.
So I assume that it was only to prevent the points from burning right ?
And if I'm right, I can use that coil with my pertronix with no resistance wire right ?
If I run pertronix with a flame-thrower coil and full 12 volts at the + side of the coil with NO resistance wire, like I said in my first post, running
at 2000 rpm it's more 13.5V, so if my math is right, that circuit will draw 13.5v/1.5ohms= 9 amps, that is more than the 8amps MAX.
that pertronix recommand, and surely not good for a long period of time. So to be safe if I can find a ballast resistor of 0.3 ohms,
I'll get 13.5/(1.5ohms coil + 0.3ohms ballast) = 7.5amps at max voltage.
If someone can approve my math I'll shop for a 0.3 ballast but I don't think there's one 0.3 ohms.
And do you think it will affect performance if a coil is getting 9, 10, or 12 volts at the + terminal ??
Thanks a lot
Last edited by Patbel; Yesterday at 12:49 PM.