Petronix coil question
 

I will be installing a Flame Thrower Petronix 6V 1.5 epoxy filled coil in my 31 sport coup. Do I need to change/increase any point, rotor or plug gaps to accommodate this more powerful coil?
Thanks, The Geezer

Re: Petronix coil question
 

You don't need to adjust anything. You can try widening the plug gap to see whether you notice any performance improvement; a few folks have reported a difference. Otherwise everything should be set to factory specs.

Re: Petronix coil question
 

Can you give me a parts number.
Thanks

Re: Petronix coil question
 

Nope, no need to change anything. Just make sure it's installed correctly.

Re: Petronix coil question
 

x2 with Patrick.

Re: Petronix coil question
 

Re: Petronix coil question
 

Give that 40k volt coil the consistency of soak it deserves, run the petronix Hall effect primary.. or go all in. And buy the FSI distributor, and have consistent timing at all engine rpm’s..

Re: Petronix coil question
 

Just make sure you connect it properly for polarity, 6V positive ground, the+ side goes to the points circuit.

Re: Petronix coil question
 

I would value a well made coil with a primary Ohm value that works well with 6-volts and a turn ratio around 100:1. Epoxy insulation can take more heat than oil so it is the best insulator used so far in construction of ignition coils. This is good for our slow rpm model A engines that generate a lot of heat build up in a coil. As to the high tension value of the output, I would question if it is actually 45K volts. It would work just as well at 35K or 40K. If the turn ratio gets too high then the output starts to suffer. A coil will only function so well with a fixed amount of point dwell time anyway. Modern electronic ignitions work in a lot different way and automatically adjust for best conditions so the coils have very good longevity in the modern era.

One thing to think about also is the back voltage that is applied to the condenser during function. If the condenser can't take it then it will fail. What ever coil is used should be well matched to the condenser used. If it's not then the condensers may have a shorter life span depending on what materials they are made from.

The "flamethrower" term is just that. It makes it sound like it's really hot when in reallity, it's not all that much different from a stock OEM coil.

Re: Petronix coil question
 

40111 Flame Thrower Petronix Coil 6V 1.5 ohm epoxy filled coil

Re: Petronix coil question
 

Thanks all for the replies and information!

Re: Petronix coil question
 

Re: Petronix coil question
 

Mine didn't last long either. I was in a remote outback town when it failed but I was able to find a new coil. Just as well I run 12 volts. If I needed a 6 volt one would still be there.
I congratulated myself on the decision to go 12 volts.

Re: Petronix coil question
 

The Gezzer why don't you go all the way and instal the petronix ignition module? This will eliminate the need to fool with points, condensers, and setting resetting gaps. I have been using this system for almost 10 years with 0 problems and no maintenance. Plug life and cleanliness have been excellent.

Re: Petronix coil question
 

Re: Petronix coil question
 

The petronix module , like all electronics requires ‘clean’ input voltage.. old switches and faulty wiring and in the model A ‘s case poor grounding will shorten its life.

Re: Petronix coil question
 

Pertronics modules are sensitive to heat as well. A lot of folks have experienced problems with their systems for various reasons. The model A distributor is not in one of the cooler areas of the engine compartment.

Re: Petronix coil question
 

That’s where the FSI distributor comes in with its aluminum body.