Coil input information

[ndutton]

Originally Posted by Dave9111

The reason for the cooked/overheated coils with the Pertronix 1146A (fixed dwell), is due to the internal resistor in the coils. If you have a 3-4 ohm resistor in the coil, the heat generated by that resistor heats up the coil and cooks it. Remove the resistor from the coil and the source of the heat is removed from the coil.

I just cut open a NAPA Echlin 905 coil (IC14), 3.5Ω measured resistance prior to the surgery. No such resistor inside.

Here are the innards as they came directly out of the canister



. . . and here are the primary windings alone (core removed), inside and out. No resistor anywhere.

Some continue to argue the minutiae of coils and ignition systems but they are arguing against that by applying the basic Ohm's Law statically to limit the system amperage to a maximum of 4 amps per Pertronix's published advisement we have had a 100% success rate in eliminating the previously common coil overheating and failures following the upgrade to electronic ignition. As of this post it has been 8 years of success.