Ignition coil failure

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SJ
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Ignition coil failure

Post by SJ » Sun Jun 26, 2016 11:01 pm

I was on the motorway the car started losing power and eventually stalled, had to get a tow home. my ignition coil had failed, swapped it for a spare and all was fine.
But is this just bad luck or is there something else that may have triggered the coil to fail.?
A quick google told me to check the spark plug gap, which i have yet to do. Any ideas?

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clive
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Re: Ignition coil failure

Post by clive » Mon Jun 27, 2016 12:56 am

What ignition do you have? Is it electronic with ballast or just plain old points?
Cheers, Clive.

(If I'm not here I'm in my workshop or on the golf course!)

SJ
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Re: Ignition coil failure

Post by SJ » Mon Jun 27, 2016 7:50 am

It is electronic, I have one of those pertronix conversion kits fitted and the coil was a black epoxy "flame thrower '

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Roger King
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Re: Ignition coil failure

Post by Roger King » Mon Jun 27, 2016 8:57 am

Which Pertronix? Ignitor I and Ignitor II are ballasted systems, requiring a ballasted coil, Ignitor III (with the built-in rev-limiter) requires the full 12V continuously. I'm assuming you do not have a separate ignition box, it's all inside the distributor.
I've had Lucas coils fail, but (touchwood) not Pertronix or other US aftermarket ones. It can happen, though, for no obvious reason. Assuming you have the correct coil for your system I would simply replace and carry a spare.

SJ
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Re: Ignition coil failure

Post by SJ » Mon Jun 27, 2016 9:20 am

It is an ignitor 1 it is fitted to a lucas 35DLM8 and the coil was a Flame Thrower 1, 1.5 ohm, 40,000.
It was what they had recomended for my set up.

I see a lot of flame throwers failing early mentioned on various American forums, and a possible commoun complaint.

I have since emailed them to see what they say.

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Roger King
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Re: Ignition coil failure

Post by Roger King » Mon Jun 27, 2016 9:32 am

Interesting - I've not had one fail, but I haven't had an Ignitor I so probably not much help! I have Mallory and MSD modules in cars, but the 289 has an Autolite distributor with an Ignitor III in it, no ballast resistor. If you have the coil Pertronix recommed, I'd stick with that. Although I'm sure you could cross-ref the spec for a 'local' one if necessary, a lot of UK cars had ballast resistors.

Karl
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Re: Ignition coil failure

Post by Karl » Mon Jun 27, 2016 9:47 am

Your coil with 1,5 Ohm resistance is correct for a V8. There should be no other ballast resistor in the system. Make sure your ignitor 1 and the coil run on 12 V DC

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Roger King
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Re: Ignition coil failure

Post by Roger King » Mon Jun 27, 2016 10:24 am

http://www.pertronix.com/docs/instructi ... s/1181.pdf

Removal of ballast resistor and use of appropriate coil recommended. Check that your ignition system is providing full 12V in the 'run' position, not just 'start'.

Roger

SJ
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Re: Ignition coil failure

Post by SJ » Mon Jun 27, 2016 12:12 pm

Thanks for all that Roger, I must check the voltage later and the specs of the old coil i re-fitted.
cheers

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