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Old 08-26-2012, 04:59 PM   #1
dstarrett
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HEI coil

Is there a reason that the coil goes bad in the HEI dist.? Was getting no spark at the no. 1 plug, so I changed out the coil on the HEI and she fired right off. Ran it a few miles last week(ran crappy but it ran), sat all week, went to start it and it hit once, and now no spark again. Rebuilt 283 with HEI from Summit. Ideas?
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Old 08-26-2012, 05:26 PM   #2
Rich 5150 69
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Re: HEI coil

When you hooked up your HEI did you run the pink wire to the dizzy, it should be direct from your ignition switch.
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Old 08-26-2012, 07:04 PM   #3
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Re: HEI coil

will double check
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Old 08-26-2012, 07:17 PM   #4
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Re: HEI coil

Because they are an epoxy filled coil, and subject to radical and severe overheating, which usually also takes the HEI module out as well. carbon brush might be bad as well, not installed correctly.

Epoxy is a heat barrier, NOT a transfer medium, as oil is. Carb heat spacer plates are made frm epoxy.

Best you can to for a coil in cap HEI is to use one of the kits to move the coil OFF that cap, and use an oil filled round coil. .
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Old 08-26-2012, 07:37 PM   #5
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Re: HEI coil

The wire from the switch runs to the coil via fuse panel, fuse is good. does it matter which terminal this wire is on? is on the back or right post as you are looking at disty from drivers side.
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Old 08-27-2012, 12:24 PM   #6
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Re: HEI coil

That path is OK, as long as that terminal is marked either IGN or IGNITION, and is full 12 volts hot in both switch positions start and run.

I have a few thousand small body HEI conversions running coil power just that way, with absolutely NO problems.
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Old 08-27-2012, 06:34 PM   #7
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Re: HEI coil

Thanks for your help! Looks like my next move is to move the coil out of the cap.
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Old 08-27-2012, 07:01 PM   #8
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Talking Re: HEI coil

Pertronix Flame-Thrower HEI Distributors
http://www.pertronix.com/prod/ig/flame/dist/hei.aspx

http://www.jegs.com/p/Pertronix/Pert...49237/10002/-1
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Old 08-27-2012, 10:59 PM   #9
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Re: HEI coil

Yup, there is one of those that needs the coil to come out of the cap, but then, that one is also made in China. I have fixed tons of them, my educated opinion about them is, they are just not worth the effort.
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Old 08-27-2012, 11:19 PM   #10
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Re: HEI coil

yea make sure you have a 12 gauge wire from the fuse box under IGN UNFUSED. run it into the BAT side on the HEI distrib, and check the module,
just some advise haha
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Old 08-28-2012, 09:54 AM   #11
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Re: HEI coil

One thing to remember, the old resistance tests for module, coil are no longer accurate.

There are auto part stores that now have off vehicle testers, and they should be used to test components. These testers run test the parts, not resistance test them.

One thing to do is NOT let the attendant just do a 5 second test and get a "yup, it works" answer, let the part run on the machine for a while, get it to operating temp, and look closely.

The reason those n cap disasters need a 12 gauge wire is, the coils are just that bad. The epoxy coils are just current hogs, and only make heat from that current, quite adverse. My remote coil, small body HEI conversions use a 14 gauge wire for both coil and module, with NO adverse effects, because the coil runs physically cooler, and that saves electrical components.
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