Duraspark with GM ignition module. What coil ? I burned up one already...
#1
Duraspark with GM ignition module. What coil ? I burned up one already...
I have a Duraspark distributor hooked to a GM ignition module. I know this set up requires a specific coil. What coil works? I bought a generic chrome coil from Jeg's and it didn't last long. It would idle for about 10 minutes then die. I tried another new Delco 1906 module and it was the same. Changed carbs, same thing. Put in the stock points coil and it ran good. Swaped back to the Jeg's coil, problem came back. I put the stock Ford coil circa 1971 and it ran good.
I let it idle for about 1/2 hour while I was charging the A/C, tracing heater A/C cable problems etc and it died again. The stock Ford points coil was hot. After it cooled down, it ran again.
I know I need a coil. Which coil should I get that will last?
I do not have an ignition resistor nor do I have an resistance wire going to the module.
Please let me know what coil you guys use that doesn't burn out or get hot and die.
Thanks.
Danford1
I let it idle for about 1/2 hour while I was charging the A/C, tracing heater A/C cable problems etc and it died again. The stock Ford points coil was hot. After it cooled down, it ran again.
I know I need a coil. Which coil should I get that will last?
I do not have an ignition resistor nor do I have an resistance wire going to the module.
Please let me know what coil you guys use that doesn't burn out or get hot and die.
Thanks.
Danford1
#3
Ever think about using a duraspark box? Apparently what you are trying to do is not working. I believe I have seen on the web people mixing and matching ignition components, so you will have to depend on them for what works for those particular setups. I don't know why they bother though, the Ford system works ok for most people.
#4
OK, I determined I DO need an ignition resistor. I've played with a few coils and it will run with an old yellow top Ford coil. I did research and found guys use a MSD Blaster 2 or 3 coil with the GM module. I bought a Blaster 3 because it had the post type coil wire hook up which I want. Measures 0.9 ohms on the primary side.
The car will not idle with the Blaster coil. I have some resistors and if I use one, it runs fine. SO I know I need a resistor.
I have 2 and they are different. One measures 1.9 ohms and when installed and running I have 9.8 - 10.0 volts between the positive coil and ground.
The other one measures 1.5 ohms and reads 11.4 volts from positive coil to ground while running.
Which one should I use or is there some other one I should get?
Thanks.
Danford1
The car will not idle with the Blaster coil. I have some resistors and if I use one, it runs fine. SO I know I need a resistor.
I have 2 and they are different. One measures 1.9 ohms and when installed and running I have 9.8 - 10.0 volts between the positive coil and ground.
The other one measures 1.5 ohms and reads 11.4 volts from positive coil to ground while running.
Which one should I use or is there some other one I should get?
Thanks.
Danford1
#5
Originally Posted by danford1
Which one should I use or is there some other one I should get?
Seriously, what's the point of all this cross-breeding? Why would you want to cut up your factory wiring to trade one ignition module for another? It's not like the GM module is an "improvement" over the Ford module. In fact, the Ford Motorcraft ignition module has the "start/retard" function that the GM and aftermarket doesn't. This feature actually retards your timing a few degrees at startup for quicker starts and allows you to run more timing.
Originally Posted by danford1
I know I need a coil. Which coil should I get that will last?
Unless you are actually racing your truck or are consistently running up to 5000+ RPM, you will *not* gain any "improvement" over a correctly functioning Duraspark ignition system!
#6
I'm going by my feeble memory, but did you heat sink the GM module? I've never used one, but remember they are required and heat does funny things to electronics. I've seen the conversion instructions somewhere and I'll see if I can find them. Stock DSI was 1.4 ohm, my DSII blue module wiring say's 1.1 ohm. Course, all bets are off with the GM module.
#7
The HEI module does need a heat sink. As for a coil, get one of the external HEI or use a Ford TFI coil, neither of these require a ballast resistor and are the correct resistance for the module. I also wonder why you would want to use a GM ignition system? A good DurasparkII system is extremely reliable, once I got rid of the cheap aftermarket module on mine in 1996 I never had any more problems.
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