Hot Coil - how hot should it be after driving? Sports Coil??

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jonahnaylor
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Hot Coil - how hot should it be after driving? Sports Coil??

Post by jonahnaylor » Mon Oct 07, 2013 10:42 pm

I just replaced my '78 MGB GT coil as it was very rusty and corroded. I opted for a 6v ballast 'Sports Coil' but after driving I found it fairly hot to touch.

1. I just wondered if these coils run hotter and if they are they ok to run so hot?
2. What does a 'Sports' coil do better than a standard coil. If both are 6v for the later rubber bumper cars, then surely they give the same output? Is this just marketing or is there a real difference?

It may be in my head but the car does seem to run a little smoother since swapping to this new coil so I'm pleased it was worth it. I believe I had the original Lucas unit before from the factory which is a great testament to how components do last!
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domtemp
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Re: Hot Coil - how hot should it be after driving? Sports Co

Post by domtemp » Mon Oct 07, 2013 11:28 pm

it could be running better just because it needed a new coil?
I am unaware if the heat output on the coils but surely it shouldn't get too hot?

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Re: Hot Coil - how hot should it be after driving? Sports Co

Post by jonahnaylor » Mon Oct 07, 2013 11:41 pm

domtemp wrote:it could be running better just because it needed a new coil?
I am unaware if the heat output on the coils but surely it shouldn't get too hot?
Haha yes it may be my imagination, but that old coil certainly looked like it's seen better days.

Another thing I noticed was on checking it's resistance with my multimeter the old coil read 3ohms on the Low tension and 9 volts on the ht circuit. The new brand new 'Sports' coil measured 2ohms LT and 6 volts HT... Quite different results, does anyone know how this would change the car running and which is correct?

It's one of the metal bodied coils, so I suppose it's bound to be hot when the car is running..?

Sorry for all the questions. It must be new part paranoia!
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adamliptrot
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Re: Hot Coil - how hot should it be after driving? Sports Co

Post by adamliptrot » Tue Oct 08, 2013 12:32 pm

Jonah, are they both ballast ignition coils? That might account for the difference in readings?
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jonahnaylor
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Re: Hot Coil - how hot should it be after driving? Sports Co

Post by jonahnaylor » Tue Oct 08, 2013 12:56 pm

adamliptrot wrote:Jonah, are they both ballast ignition coils? That might account for the difference in readings?
Well I read a fair bit on different websites before ordering but there seems a lot of Coil confusion out there. Maybe a 9v Coil is the unballasted older car "12v coil" - I didn't think of that one...

Or is there 6v, 9v and 12v - or my old one maybe was just on it's way out...

Haha the new one has no marking on it at all (I got it from Moss) - but the old one had the serial number SFU 21949601 on the bottom and marked Lucas on the top.
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allanr
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Re: Hot Coil - how hot should it be after driving? Sports Co

Post by allanr » Tue Oct 08, 2013 5:30 pm

Hi

I seem to have read somewhere that you have a resistor in the wire to your coil and you should be using a 9v coil. This was so that at starting the voltage to the coil was 12 to give a bigger spark then 9v running. Andy Capy would be able to help you there his number is 01582 832305 he writes a lot of articles in MGOC and is well informed about this.

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Re: Hot Coil - how hot should it be after driving? Sports Co

Post by jonahnaylor » Tue Oct 08, 2013 7:00 pm

Thanks I'll try giving him a call and ask his advice.
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