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#13

07-12-2011, 11:24 AM

JimsRebel

Fleet Mechanic

Join Date: Mar 2008

Location: Washington

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Quote:

Originally Posted by Amphenol

Thanks F250!

C&P from • View topic - Duraspark ignition system - What is the weak point?

"turns out the duraspark coil wants 8 volts not 13.4 so it gets hot and stalls out. it has too much resistance for the GM HEI so you have to run a low primary resistance coil, Less than 1 ohm. MSD Blaster II fits in with 0.7 ohms. vrs the 1.5 ohm duraspark coil."

Could this be my problem?

The way you have it wired the coil is still down stream of the resistor wire, with either the GM 4 pin or the DS2 module, so the coil supply voltage will be the same.

I am running a square TFI coil which has a lower primary coil resistance than the older round coils with my 4 pin GM module.

You could run a jumper wire from the battery positive to the coil positive when it starts to run bad to test to see if it makes any difference.

In order to really gain anything with the GM 4 pin module you should use a better coil and full voltage to the coil positive. The coil is just a step up transformer, the more input the higher the secondary output.
Jim

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