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EFV-8 Club Forum / General Ford Discussion / 1950 Ford Custom V8

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Discussion Topic: 1950 Ford Custom V8

jltorrey

04-07-2020 @ 6:24 AM

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I inherited a 1950 Ford Custom Convertible. A previous owner converted this to a 12v system from 6v. The ignition coil overheated and when I removed it there wasn't any identification on it. I checked the voltage going to the coil and it tested 12v. I had a 6v coil on the shelf and hooked it up and the car started and ran. My question is whether I should install a 12v coil vs. the 6v coil. I tested the primary resistance across both the overheated 6v coil and the new 6v coil. They both tested at ~ 1.6 ohms. I have 12v coil and it tests ~3.5 ohms across the primary. My calculation says a normal 6v coil in a 6v system would put 4amps out to the distributor (6/1.5=4). However if you put 12v to a 6v coil it would deliver ~ 8 amps. It seems a 12v coil makes sense. Will the 12v coil deliver too much spark energy? Appreciate any comments.

40cpe

04-07-2020 @ 9:58 AM

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It is commonly accepted that a 12v points system needs about 3 to 3.5 ohms total resistance. This would be the combination of a ballast resistor, if any, and the resistance between the plus and minus terminals on the coil. If you use one of the 6v coils you measured you would need a ballast resistor of about 1.5 ohms. The coil you measured at 3.5 ohms should be great for your car. As a side note, measure the resistance of your meter leads by placing them together. Subtract that reading from the reading you get across the coil terminals.

supereal

04-07-2020 @ 2:41 PM

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Skip Haney can rewind the 6 volt coil for 12 volts. If the rest of the car is converted to 12 volts, that is the simplest way to solve your problem. You can reach him at
941-637-6698 or 941-505-9085.

jltorrey

04-08-2020 @ 5:19 AM

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Thank-you. As I mentioned previous I have a new 12v coil. Does anyone know the difference in the output of the 12V coil to the spark plugs vs. the 6v coil? Any concens about this?

40cpe

04-08-2020 @ 7:47 AM

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There is no concern. If the plugs, plug wires, cap, and the rest of the ignition system are in good shape the voltage of a coil rises until it jumps the gap in the plug.

jltorrey

04-16-2020 @ 3:54 AM

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Thank-you all for your input. Best Regards!

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