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Oil leaking from the top of the coil?

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Old Feb 18, 2010 | 03:26 AM
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Default Oil leaking from the top of the coil?

Ok so I just noticed that there is a little bit of oil at the top of my coil. I first noticed a tiny bit on the bottom of it (leaked down from the top) when I was changing my starter.


Why would my coil be leaking oil? And is it going to die soon?


P.S. Orig had a flamethrower coil and it died on the freeway so I had to buy one from auto zone and got an accell one exactly 1 year ago. So this accell coil is 1 year old.
Old Feb 18, 2010 | 03:45 AM
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Coils are transformers. The oil helps to cool them. If it's leaking it will need to be replaced, since air will get in and the oil will vaporize into the air pocket, mix, and probably ignite, and your coil will explode...or at least burn up in flames.

That's what causes some transformer explosions(oil filled ones anyway).
Old Feb 18, 2010 | 04:12 AM
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should i get another oil filled one? Also what brands are recommended?
Old Feb 18, 2010 | 04:19 AM
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I agree, it needs to be replaced soon.

What distributor / ignition are you running? Do you have the Pertronix Ignitor? It can make a difference which coil to get, since they come in different resistance values.

Do you remember if you had a Flamethrower or Flamethrower II coil before?

Where do you have it mounted? I relocated mine to the inner fender to keep the engine heat away from it.

Last edited by tx65coupe; Feb 18, 2010 at 04:21 AM.
Old Feb 18, 2010 | 04:22 AM
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its a motorcraft distributor. coil was a flamethrower 1 oil filled before.
Old Feb 18, 2010 | 03:48 PM
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They're all oil filled to my knowledge. The non oil ones for industrial stuff are usually wrapped in porcelain. But a 220+KV power station transformer is quite a different beast from an automotive ignition coil.
Old Feb 18, 2010 | 05:17 PM
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They sell that flame thrower one in a black unit on summit that is expoxy filled. Not sure what the function does.
Old Feb 18, 2010 | 06:35 PM
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The point of oil or epoxy filling is to allow heat transfer out of the coil, preventing hot spots inside. If yours is leaking oil, it's either defective, damaged, or has been run at excessive voltage. Before you spring for a new coil, check the voltage to the coil. I'd hate to see you fry the new one.
Old Feb 18, 2010 | 07:05 PM
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Originally Posted by 2+2GT
The point of oil or epoxy filling is to allow heat transfer out of the coil, preventing hot spots inside. If yours is leaking oil, it's either defective, damaged, or has been run at excessive voltage. Before you spring for a new coil, check the voltage to the coil. I'd hate to see you fry the new one.

What voltage should it be getting? 12-14v im assuming?
Old Feb 18, 2010 | 07:11 PM
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Originally Posted by nba1341
What voltage should it be getting? 12-14v im assuming?
Nope. More like 7V. 14V would certainly explain why the oil is fleeing the scene. The coil should only get the full 12V while the starter is engaged.



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