IC14 12V conversion coil

[matthewh]

I need a coil for B converted to 12 volt. I don't know the differance between the NAPA IC12 and the much less expensive IC12-SB. Anyone know the differance and correct one for the application? thanks

 

[Lee B]

No I don't sorry. But you are throwing your money away if you are not buying a Pertronix Flamethrower coil for your B. At $35 it's not that much more than you have to pay for an entry level coil like the NAPA, but for the extra money you'll get so much more fire that I don't buy anything else anymore. They have both the 3 ohm 12v resistorless coil and the 1.5 ohm 6v or 12v "used with a resistor" coil in black or chrome.

In order to answer your question, we will need to know if you have a ballast resistor in your 12 volt ignition circuit or not. It almost sounds like IC12 and IC12-SB are 1.5 ohm and 3 ohm coils respectively but I wouldn't think that would affect the price, at least it shouldn't. It doesn't one whit among the Pertronix coils for example.

Do you have a volt/ohm meter? Care to take an ohms reading across the primary of the coil you already have?

 

[Duane Larson]

matthewh,
The expensive one is made by Echlin, probably in the US. The cheap one is part of NAPA's Mileage Plus Electrical line and is surely imported. I would guess the electrical properties would be the same.

 

[matthewh]

Thanks for flamethrower input.

As best I can tell, both coils are 12v coils not requiring external resistor (3 ohm). I found the NAPA part number(s) here in the archives for coils used in 12v conversions. I thought that the SB may be just left off in some discussions, but I found both coils listed on the NAPA site. One for IC14 for $48 and the IC14SB for $19.

I do not currently have a resistor. I can check the impediance, but as I already let the smoke out of it by leaving the ignition switch on, I did not bother. Come to think of it, if it were a low impediance coil and no reisitor on a 12v system, it might explain why it got so hot so fast.

thanks