ffinmich

Member
Need a new coil, I have read not to use tisco, what brand should I use and where can I get it.
6v, front mount.
Thanks
 
i would avoid tisco points.. coils however.. you have very, very few choices. i'd wager there is only a very small number of factories making that coil.. maybee even just 1...

get your 6v square coil whereever it is cheaper.

use the correct ballast resistor.. don't leave your key on, keep points gapped correctly.. that's the best you can do.
 
The other thing you can do is to convert the ignition system to use a round 6 volt coil the way I did on my old 9n. By doing this you don't need any resistor. It worked very well for me and was reliable.
 
I've had good luck with a round coil coversion too. Gutted the old square coil and used the box for the adaptor. The modern, round, coils can stand about 10x the abuse the square coils can, and give a hotter more reliable spark.

If you forget and leave the key for and extended period of time with a square coil odds are good it will burn itself up, or, worse, develop some intermittant problems that will make your life hell until you figure out what is going on. Round coils seem to handle it no problem.


(quoted from post at 14:01:56 09/03/14) The other thing you can do is to convert the ignition system to use a round 6 volt coil the way I did on my old 9n. By doing this you don't need any resistor. It worked very well for me and was reliable.
 
When they first came out with the 9N Ford, I think that the old square coils and their resistors were built a lot more rugged then than they are today. We had 6 volt round coils on our model A's and no resistors and we didn't seem to have a problem with them. I don't know why Ford didn't adopt that same round coil to their 9ns, 2ns and early 8ns.
 
most of the coil all come from the same place. Only the box is different. I have never had any luck with any coil I got from NAPA. If you buy a NAPA coil you better buy three.

my 9n still has a ford coil. works just fine. If leave the key turned on. You can burn out a round coil.
 
(quoted from post at 14:49:56 09/03/14) most of the coil all come from the same place. Only the box is different. I have never had any luck with any coil I got from NAPA. If you buy a NAPA coil you better buy three.

my 9n still has a ford coil. works just fine. If leave the key turned on. You can burn out a round coil.

Burning a coil up is a function of battery voltage and coil construction. Because of the insulation used, a square coil will melt quicker than a round coil. And a 12 v coil will melt quicker than a 6v coil. It's very hard to melt a 6v round coil because the battery will go dead first. But leaving the key on is never a good idea.
 
I have often wondered that as well. The square coil
could have been wound similar to the round coil and
none of would have had that resistor problem
 

The construction of the square coil gave minimal resistance ( .03 ohms in some) That resulted in very high current at start up. As the ballast resistor heated up it reduced the current. The round coils had a higher internal resistance and most did not use a resistor.
 
(quoted from post at 12:30:25 09/03/14)
The construction of the square coil gave minimal resistance ( .03 ohms in some) That resulted in very high current at start up. As the ballast resistor heated up it reduced the current. The round coils had a higher internal resistance and most did not use a resistor.

Thank you. Simple enough.
Almost makes me want to get a round coil to keep around for if and when my square one bites the dust.

What type of dist. cap and rotor is used for a front mount if I want to use a round coil?
 
It was one of Ford's "better ideas".

For whatever quirky corporate reason, they used the same type of low-resistance coil with external ballast resistor on their 6 Volt cars and trucks.

I believe GM, at some point, did something similar, and used an external resistor with an odd-ball switch operated by the foot-starter pedal link to over-ride it during cranking on the six-Volt systems. Of course, they did something similar on the 12 Volt systems, with a bypass contact integral to the starter switch or solenoid.

I guess there is some good intent behind both systems, though, as battery voltage (and therefore SPARK) is reduced during cranking.

Ford's system used a PTC resistor, it's resistance increased as it warmed up, and HOPEFULLY your engine started BEFORE the resistor warmed up to "run" mode.

GM's was a positive bypass that simply jumpered across the resistor during cranking.
 

The less the better. Spec is .03 to .08, IIRC. Reality for new square coils is anything less than 1.5 ohms. I've got 3 Ford script coils all less than 1 ohm.
 

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