Classic cars forum & vehicle restoration.
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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 Posted: Mon May 26, 2014 4:50 pm Post subject: 12v Coil |
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I have a slight issue with the singer when shes hot.
I reckon it may be down to one of 2 things so I need to eliminate both issues.
1 issue may be the fuel pipe and in-line filter getting too hot from the radiator top hose, I can rectify this by shortening the fuel hose line.
2nd issue may be the coil breaking down when hot, so, what replacement coil do I need and more importantly where from?
It needs to be 12v, compatible with electronic ignition and have spade type connections.
Kev |
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MikeEdwards
Joined: 25 May 2011
Posts: 2470
Location: South Cheshire
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| Posted: Mon May 26, 2014 6:46 pm Post subject: |
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Depends on the vehicle, surely, and what ignition system it has.
I am confused by coils, though. Mine (the one it should have, that is) is marked "12v", except it's designed to run on a system that has a ballast wire so it actually runs at 6v most of the time, and 12v during cranking. So why it isn't marked "6v" is beyond me, would be so much less confusing. |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Mon May 26, 2014 6:55 pm Post subject: |
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| MikeEdwards wrote: | Depends on the vehicle, surely, and what ignition system it has.
I am confused by coils, though. Mine (the one it should have, that is) is marked "12v", except it's designed to run on a system that has a ballast wire so it actually runs at 6v most of the time, and 12v during cranking. So why it isn't marked "6v" is beyond me, would be so much less confusing. |
im confused by coils too, hence the asking.
I will strip the old one off tomorrow and see what markings are on it.
The ignition is electronic but fitted many years ago by the previous owner.
Kev |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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| Posted: Mon May 26, 2014 7:02 pm Post subject: |
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Hi Kev
Most electronic ignition kits specify the lowest coil resistance that can be switched, use this as a guide when sourcing a replacement coil. The lower the coils resistance the more energy it can store.
Cheers
Dave |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Mon May 26, 2014 7:06 pm Post subject: |
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| ukdave2002 wrote: | Hi Kev
Most electronic ignition kits specify the lowest coil resistance that can be switched, use this as a guide when sourcing a replacement coil. The lower the coils resistance the more energy it can store.
Cheers
Dave |
dave, I need links/pictures! idiots guide etc
the one on it at the mo is just a plain silver bodied jobby, cant see any markings at all! |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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| Posted: Mon May 26, 2014 7:54 pm Post subject: |
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Yep, that would do the job  |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Mon May 26, 2014 7:58 pm Post subject: |
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| ukdave2002 wrote: | | Yep, that would do the job |
Ta  |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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| Posted: Tue May 27, 2014 7:53 am Post subject: |
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| MikeEdwards wrote: | Depends on the vehicle, surely, and what ignition system it has.
I am confused by coils, though. Mine (the one it should have, that is) is marked "12v", except it's designed to run on a system that has a ballast wire so it actually runs at 6v most of the time, and 12v during cranking. So why it isn't marked "6v" is beyond me, would be so much less confusing. |
Mike
A coil only marked 12v normally means it's for a non ballast system, I'd check the resistance of the coil, it should be the same as the ballast resistor, normally both are about 1.5 ohms. A standard (non ballasted ) 12vcoil will be about 3 ohms.
Cheers
Dave |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Tue May 27, 2014 8:01 am Post subject: |
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| ukdave2002 wrote: | | MikeEdwards wrote: | Depends on the vehicle, surely, and what ignition system it has.
I am confused by coils, though. Mine (the one it should have, that is) is marked "12v", except it's designed to run on a system that has a ballast wire so it actually runs at 6v most of the time, and 12v during cranking. So why it isn't marked "6v" is beyond me, would be so much less confusing. |
Mike
A coil only marked 12v normally means it's for a non ballast system, I'd check the resistance of the coil, it should be the same as the ballast resistor, normally both are about 1.5 ohms. A standard (non ballasted ) 12vcoil will be about 3 ohms.
Cheers
Dave |
tested it last night, it came in as 3.8
kev |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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| Posted: Tue May 27, 2014 8:38 am Post subject: |
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| kevin2306 wrote: | | ukdave2002 wrote: | | MikeEdwards wrote: | Depends on the vehicle, surely, and what ignition system it has.
I am confused by coils, though. Mine (the one it should have, that is) is marked "12v", except it's designed to run on a system that has a ballast wire so it actually runs at 6v most of the time, and 12v during cranking. So why it isn't marked "6v" is beyond me, would be so much less confusing. |
Mike
A coil only marked 12v normally means it's for a non ballast system, I'd check the resistance of the coil, it should be the same as the ballast resistor, normally both are about 1.5 ohms. A standard (non ballasted ) 12vcoil will be about 3 ohms.
Cheers
Dave |
tested it last night, it came in as 3.8
kev |
So swapping it for the Lucas dlb105 coil (3 ohm) would make upto 25% more energy available to the ignition system . That's not to say the car will run any better under normal conditions, but it will help starting on cold winter mornings electronic ignition and a better coil will also allow you to open up the plugs a tad more.
Cheers
Dave |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Tue May 27, 2014 9:49 am Post subject: |
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I dont know if there is actually anything wrong with the coil as fitted, but changing it cant do any harm eh..anything to improve reliability. Pulled a plug out last night and they are not too bad to be fair, slightly rich still but id prefer that to running weak in an older car.
Kev |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Tue May 27, 2014 11:37 am Post subject: |
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just thinking about coils, and to improve my knowledge..
what happens if you fit a coil that is designed to work with electronic ignition onto a point set-up?
do they burn out or suffer poor performance?
Kev |
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47Jag
Joined: 26 Jun 2008
Posts: 1480
Location: Bothwell, Scotland
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| Posted: Tue May 27, 2014 12:09 pm Post subject: |
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Kevin,
It would burn the points out. As Dave told you previously the 'transistor' coil has a lower resistance and therefore a higher current draw. The transistor is there to handle the higher current. We can give you the technical reasons if you REALLY REALY want to know.
Art |
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kevin2306
Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales
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| Posted: Tue May 27, 2014 12:41 pm Post subject: |
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| 47Jag wrote: | Kevin,
It would burn the points out. As Dave told you previously the 'transistor' coil has a lower resistance and therefore a higher current draw. The transistor is there to handle the higher current. We can give you the technical reasons if you REALLY REALY want to know.
Art |
nope, just the end result is worth knowing,
Kev |
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