I'm going to run a Duraspark II ignition in my '67 Fairlane with a 351W. This will strictly be a cruiser. What's a good choice for a coil on this setup?
they overheated. the later models had the module affixed to a heat sink.The duraspark was OK, but poor components and connections made them unreliable. If your distributor is of that system, use it to drive a 6AL-2 and select a coil with compatible impedance. Or you could do the same with a pertronix digital hp 512. Both are capacitive discharge to give a longer hotter spark, and both have settable rev limiters and switches. Either would be superior to a duraspark.
Just need to keep away from heat sources. I mounted mine on a piece of aluminum with an air gap behind it.
I don't like TFI, there was a lot of problems with modules dying. Strange thing, if you popped off the plastic cover of a TFI, then shine a bright flashlight on the submerged board with the engine running, it would die.
The resister wire only drops voltage if there is a low resistance load on it... testing the voltage with a high internal resistance VOM doesn't load the wire enough and doesn't show a voltage drop... checking the voltage with the engine running should show lower voltage reading...1. Should I have less than battery voltage at the coil given that there's a resistor wire in the circuit.