6 volt coils

[flatheadfan]

Quick question. Are Ford 8N tractor 6V coils the same as 1949-51 passenger 6V coils? Physically they look the same.

Thanks

Tom

[WestCoast]

I have used them and my car rah good, the reason I used them is because I could get them off the shelf at the ford tractor dealers, always worked for me

[flatheadfan]

Thanks! I kinda thought the passenger and tractor coils were the same. Both are 6 volt positive ground. For me, the big plus is tractor coils are readily available locally and are more price competitive than mail order with shipping.

Thanks again.

Tom

[JSeery]

In theory the tractor (8N) coil would be designed for a 4 cylinder engine that runs at low RPM while a car/truck coil would be designed for an 8 cylinder engine at higher RPMs. The difference would be the saturation time of the coil. In practice I'm not sure if there is a real difference or not, Bubba might know the answer, but something to consider. If there is a deference in the design it would mean that the coil would appear to run great at lower RPMs but not provide a proper spark as the RPMs increased.

[rotorwrench]

Ford used several part number coils for 4, 6 & 8 cylinder cars & trucks. It is true that the 8 cylinder car has the least dwell time for saturation so it would have had a coil that was more stable for short duration saturation. In reality, they are likely similar in primary resistance since FoMoCo was into saving bucks so they most likely used one that would at least work well on a V8. The 1.5 Ohm primary can type coil was common clear up into the 12-volt era even though they had different part numbers and the 12-volters used an external ballast resistor.

[FlatheadTed]

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I think they would work they are 3/5 volt .I have rebuilt them but to 6volt ,they do have the Carbone brush were the wire goes so adapting will be needed. Ted