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Dumb question

N

notjustair

Well-known Member
Just bought a '50 M. Runs very nice. Uses a bit of oil, but has sat for a long time, so it may loosen up.

PO changed it over to 12 volt. I prefer original, but it is well done and not sloppy. He put in a 12 volt coil (which I hear isn't the best option). Here is my dumb question: would it still use the original style points/condenser? The coil should put out the same juice to the distributor regardless of whether it is 6 on 6 volt, 12 or 6 with a resistor on a 12 volt, right? This is my first engine of any type that has been converted from 6 to 12.
 
Yes it still uses original points and condenser.

I'm a big fan of 12v conversions and immediately convert mine. I use the 12v coil with no external resistor required and have never had an issue. I think that coil is the best option.
 
Do this and it will loosen up fast and also may help you save in the long run. Pour about a 1/4 cup of ATF in each cylinder and let it sit a couple days. Then use it and if you want to help it even more put a quart of ATF in 3 gal of gas. Doing the ATF in the cylinders will free up the sticking rings and the ATF in the gas will free up any sticking valves
 
Theres no dumb questions, but one does see dumb answers now n then.

Your basically correct, YES you can use the same points regardless if on a 6 or 12 volt system. The points are a current switching device with a voltage withstand rating FAR FAR HIGHER THEN 6 OR 12 VOLTS ANYWAY...

The points are designed to switch in the vicinity of 4 amps or so but if thats increased drastically they will burn up pretty fast. HOWEVER in a 6 or 12 volt system, that coil current is still close to the same (i.e. 4 amps or so or less)

In a 12 volt system the total primary (coil + any ballast) resistance is around 3 ohms and 12/3 = 4 amps. In a 6 volt system, the total primary resistance is around 1.5 ohms and 6/1.5 again = 4 amps.

If you use a 6 volt coil (around 1.5 ohms) and a series ballast (around 1.5 ohms) on a 12 volt system, the points switch around 4 amps (12/3) ,,,,,,,,,same current as if you used a unballasted 12 volt coil (around 3 ohms),,,,,,,,,same as if you used a 6 volt coil (1.5 ohms) on a 6 volt tractor......

Got it???

John T
 
If I remember correctly the electronic ignition conversion for 12v is relatively cheap while for 6v its fairly expensive. I think if I had a 12v tractor I'd probably go right ahead and do the electronic ignition too.

As far as I'm concerned electronic ignition is one of the greatest inventions the world has ever seen...
 
Thanks guys! You answered all of my questions and even more. Now if this crazy weather would straighten up I could get on it and work it out a while...
 
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