Mopar 318 Ignition upgrade
Hi,Now does this mean that this coil doesn't work with the original resistor (4 pin
https://www.jimsautoparts.com/P4529795.jpg) and I have to order the 8203 version?
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The "4 pin" resistor is two resistors. One is just like the old style 2 pin "points" coil resistor, and that is ALSO just like (or close to) the newer 2 pin electronic resistor.
The second half of the 4 pin setup is to supply power to the OLDER "known as 5 pin" ECU boxes. MOST ECU boxes are no longer 5 pin. You cannot tell however by looking. Some 4 pin boxes have 5 physical pins. Frankly, I would just leave things alone until you do the HEI conversion
A canister style coil requires from 1.0 to 1.5 ohms to survive without overheating.
But the MSD has resistance 0.700 ohm..
That statement depends on who made the coil and "what" it is. It is pretty much true ONLY of OEM coils.
Negating the HEI issue. There is "a couple of things'
Let's say you were using the MSD with "points," no electronic. What you would want to do is use whatever resistor the COIL MANUFACTURER says to use. "Pay attention." some of the older Mallory and Accel coils, what you did was ADD the new aftermarket resistor in series!!!! with the old existing OEM resistor.
With Mopar ECU boxes, this adds a SECOND issue. There is some coil combos that are not going to work with those boxes.......too much current.......without proper resistor. This gets into a whole can of worms esp with modern day chineseoated replacement parts
The HEI modules SEEM to be pretty tolerant because of internal circuitry in the module. I ran mine for two years using the factory Mopar coil and NO resistor. There is NO doubt it generates a much much hotter spark than did the old ECU /resistor setup.
Whether that blaster is a good choice for the HEI I have no idea.
