The Ford Barn

The Geezer · 12-13-2022, 08:48 PM

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

alexiskai · 12-13-2022, 10:48 PM

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.

Joop · 12-13-2022, 10:58 PM

Can you give me a parts number.
Thanks

Patrick L. · 12-14-2022, 08:11 AM

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

old31 · 12-14-2022, 09:18 AM

x2 with Patrick.

Y-Blockhead · 12-14-2022, 10:31 AM

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Quote:

Originally Posted by Joop

Can you give me a parts number.
Thanks

#40111 for 1.5 ohm epoxy filled Flamethrower, 40611 for 3.0 ohm.

jack backer · 12-14-2022, 11:26 AM

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..

katy · 12-14-2022, 11:39 AM

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

rotorwrench · 12-14-2022, 11:50 AM

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.

The Geezer · 12-14-2022, 05:21 PM

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

The Geezer · 12-14-2022, 05:25 PM

Thanks all for the replies and information!

Ramman · 12-14-2022, 08:20 PM

I will probably look like I've been hit with a Flamethrower, but my experience with Petronix products is.......wear comfortable walking shoes.

Synchro909 · 12-14-2022, 09:59 PM

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.

CT Jack · 12-14-2022, 10:38 PM

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.

Y-Blockhead · 12-14-2022, 11:45 PM

Funny how different folks have different experiences.

I have had a Pertronix 40611 coil (12v) on the Town Sedan for ~8 years, no problems. Just don't let it bite you... (I have a pacemaker

).

I also have a Pertronix III module with MDI and an adjustable REV limiter on the '55 Ranchwagon. It works great on the Y-Block but would be over kill on a Model A.

jack backer · 12-15-2022, 06:13 AM

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.

rotorwrench · 12-15-2022, 07:09 AM

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.

jack backer · 12-15-2022, 11:14 AM

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

12-13-2022, 08:48 PM	#1
The Geezer Senior Member Join Date: Jul 2022 Location: The Villages FL Posts: 166	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 __________________ “Finally driving a car older than me!”

12-13-2022, 10:48 PM	#2
alexiskai Senior Member Join Date: Apr 2018 Location: Mebane NC Posts: 2,848	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.

12-13-2022, 10:58 PM	#3
Joop Senior Member Join Date: May 2010 Location: Glendale, AZ Posts: 3,021	Re: Petronix coil question Can you give me a parts number. Thanks

12-14-2022, 09:18 AM	#5
old31 Senior Member Join Date: Jan 2016 Posts: 2,460	Re: Petronix coil question x2 with Patrick.

12-14-2022, 11:26 AM	#7
jack backer BANNED Join Date: Mar 2022 Location: Chenango Bridge NY Posts: 433	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..

12-14-2022, 08:11 AM	#4
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Petronix coil question Nope, no need to change anything. Just make sure it's installed correctly.

12-14-2022, 11:39 AM	#8
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,715	Re: Petronix coil question Just make sure you connect it properly for polarity, 6V positive ground, the+ side goes to the points circuit. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

12-14-2022, 11:50 AM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 17,410	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.

12-14-2022, 05:21 PM	#10
The Geezer Senior Member Join Date: Jul 2022 Location: The Villages FL Posts: 166	Re: Petronix coil question 40111 Flame Thrower Petronix Coil 6V 1.5 ohm epoxy filled coil __________________ “Finally driving a car older than me!”

12-14-2022, 05:25 PM	#11
The Geezer Senior Member Join Date: Jul 2022 Location: The Villages FL Posts: 166	Re: Petronix coil question Thanks all for the replies and information! __________________ “Finally driving a car older than me!”

12-14-2022, 08:20 PM	#12
Ramman Member Join Date: Oct 2022 Location: Findlay, Ohio Posts: 96	Re: Petronix coil question I will probably look like I've been hit with a Flamethrower, but my experience with Petronix products is.......wear comfortable walking shoes.

12-14-2022, 09:59 PM	#13
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 8,044	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. __________________ I sometimes wonder what happened to the people who asked me for directions. Even at my age, I still like to look at a young, attractive woman but I can't really remember why.

12-14-2022, 10:38 PM	#14
CT Jack Senior Member Join Date: May 2010 Location: Hebron, CT Posts: 537	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.

12-14-2022, 11:45 PM	#15
Y-Blockhead Senior Member Join Date: Jul 2011 Location: Redondo Beach, CA Posts: 6,647	Re: Petronix coil question Funny how different folks have different experiences. I have had a Pertronix 40611 coil (12v) on the Town Sedan for ~8 years, no problems. Just don't let it bite you... (I have a pacemaker ). I also have a Pertronix III module with MDI and an adjustable REV limiter on the '55 Ranchwagon. It works great on the Y-Block but would be over kill on a Model A.

12-15-2022, 06:13 AM	#16
jack backer BANNED Join Date: Mar 2022 Location: Chenango Bridge NY Posts: 433	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.

12-15-2022, 07:09 AM	#17
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 17,410	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.

12-15-2022, 11:14 AM	#18
jack backer BANNED Join Date: Mar 2022 Location: Chenango Bridge NY Posts: 433	Re: Petronix coil question That’s where the FSI distributor comes in with its aluminum body.