12v ignition resistor or not

ZV 5.4L · Feb 24, 2009

I forget weather or not a resister is needed on a side mount 8N, with 12v electric igniton and flame thrower coil. The tractor had a resister on it that converted 12v to 6v, i know that one is not needed, however is another needed?

thanks,

Zach

Bruce (VA) · Feb 24, 2009

Some round coils are marked "no external resistor required". Others are marked to require an external resistor. Apparently your coil isn't marked at all. Chances are it doesn't need one, but measure the resistance of the coil & you will know for sure. The NAPA coil, p/n IC14SB does not need a resistor & measures 3.25 ohms. If your coil is equal to or greater than 3.25 ohms, you are good to go.
50 Tips

Dell (WA) · Feb 24, 2009

Zack.......did you read the instructions that came with yer 12v "FlameThrower" electronic ignition coil??? That is why you pay BIG $$$. Call the electronic ignition coil manufacturer and ask. Simple, eh???

As a general rule, real 12v coils don't need extra resistance. That is why they are 12v coils. Sheesh!!! ........Dell, yer self-appointed sparkie-meister

souNdguy · Feb 24, 2009

Maybee even less on that ei.. since there are no points to burn.. they may have a lower resistance coil .. though not much more.. guess it depends on what the manufacturer decided as current throughput for that module and coil..?

you'd think the manufacturer would provide good detailed instructions...

soundguy

JMOR · Feb 24, 2009

(quoted from post at 10:10:01 02/24/09) I forget weather or not a resister is needed on a side mount 8N, with 12v electric igniton and flame thrower coil. The tractor had a resister on it that converted 12v to 6v, i know that one is not needed, however is another needed?

thanks,

Zach

Definitely read your installation instructions (for 1247, their sheet says 3 ohms minimum) and some of the FlameThrower coils are as low as 0.5 ohms. I fully expect the 1247 module & a 0.5 coil will let the smoke out.
They have a toll free number.

Don B · Feb 24, 2009

Jesse....the "flame thrower" from Pertronix says right on the coil that it is a 3.0 ohm coil.It also says "made in China".The ones that I have measured,measure about 3.3 ohms.If you are measuring .5 ohms,there is something wrong.
If I was using a flame thrower,I would widen the points gap to about .035,since this is why one would use the 40000 volt coil,to be able to open the points and gain better fuel efficiency and more power.IMHO don b

JMOR · Feb 24, 2009

(quoted from post at 13:26:38 02/24/09) Jesse....the "flame thrower" from Pertronix says right on the coil that it is a 3.0 ohm coil.It also says "made in China".The ones that I have measured,measure about 3.3 ohms.If you are measuring .5 ohms,there is something wrong.
If I was using a flame thrower,I would widen the points gap to about .035,since this is why one would use the 40000 volt coil,to be able to open the points and gain better fuel efficiency and more power.IMHO don b

No, Don, I have not measured the 0.5 ohms, it is just that they list several FlameThrower coils of 0.6, 1.5, and 3.0, ohms and I was suggesting that since he didn't know what he had and that several were available that he best find out before damaging something expensive. If he got it all thru you, then I'm sure he has the right combination of matching components.
http://www.fastpts.com/cgi-bin/hazel-cgi/hazel.cgi?action=serve&item=pertcoils.html#40000v

Don B · Feb 24, 2009

Sorry Jesse....I didn't realize they made diff "flame throwers", since the only ones I have had any dealings with were for the tractor.Yes, by all means,always check the coil resistance,even if it does state on the coils what they are supposed to be,or what one is told. don b

ZV 5.4L · Feb 24, 2009

(quoted from post at 08:00:33 02/24/09) Zack.......did you read the instructions that came with yer 12v "FlameThrower" electronic ignition coil??? That is why you pay BIG $$$. Call the electronic ignition coil manufacturer and ask. Simple, eh???

As a general rule, real 12v coils don't need extra resistance. That is why they are 12v coils. Sheesh!!! ........Dell, yer self-appointed sparkie-meister

If there was instructions then i wouldn't be wasting everyone's time on here. I was under the impresson that 12v dosent need resistor, however there are diagrams out there that show them...

Big money? Hell, you buy the electric ignition once and yer done, there worth there weight in gold vs points IMO

Zach

Dell (WA) · Feb 24, 2009

well Zack.......I've owned my eazy starting 6-volt 52-8N for 20yrs and replaced the points ONCE. $5 (cheap) and I average about 100hrs per year. Its yer call.

I am NOT anti-electronic ignition. My semi-race 1969 BMW 2002 (7500rpm 165hp) has electronic ignition and a Bosch Blue Coil and goes like snott. ......Dell

JMOR · Feb 24, 2009

(quoted from post at 16:43:49 02/24/09)

(quoted from post at 08:00:33 02/24/09) Zack.......did you read the instructions that came with yer 12v "FlameThrower" electronic ignition coil??? That is why you pay BIG $$$. Call the electronic ignition coil manufacturer and ask. Simple, eh???

As a general rule, real 12v coils don't need extra resistance. That is why they are 12v coils. Sheesh!!! ........Dell, yer self-appointed sparkie-meister

Click to expand...

If there was instructions then i wouldn't be wasting everyone's time on here. I was under the impresson that 12v dosent need resistor, however there are diagrams out there that show them...

Big money? Hell, you buy the electric ignition once and yer done, there worth there weight in gold vs points IMO

Zach

I can't tell if you got your question answered or not, but just because it says 12v on the coil does not always mean it can be used without a resistor. Some need the & some don't. It is best to do as the Electronic Ign Module maker says, BECAUSE, only he knows how much current his module will tolerate & still live. As the Pertronix data sheet here shows, they want 3 ohms or more & if the coil is less, then add the difference to get up to 3 ohms. That being said, Pertronix makes many different modules & coils, so you need to check with them. From Don-b's response, it sounds like he sells only the 3-3.3 ohm coils (safe w/o res).
Now, if you bought your module and coil as a package, then you are probably safe to run with what they sold you. As for myself, I don't operate on probably unless I'm forced.

ZV 5.4L · Feb 24, 2009

Ahh so your a german car fanatic, as am I. We turbocharge early rabbits and scirroccos.

What type of racing do you do?

ZV 5.4L · Feb 24, 2009

Both came from nnalert, igniton instructions shows either way, so it depends on the coil...

Dell (WA) · Feb 24, 2009

Zack.......the original 1969 BMW 2002 engine was rated 110-hp DIN (Dutchland Invented Number) Mine was dyno'd at 165-hp SAE. A mild compression increase, stock cam, dual DCOE-45 Webbers, mechanical ignition advance, and no smogpump. 28mpg Still passes smog law inspection. It was my everyday commuter until semi-retired at 385K mi infavor of VW Rabbit Diesel Pickup. Handier to haul a feedsack or bale of alfalfa home in. ......Dell, head shepherd of RockyRidge SheepStation

12v ignition resistor or not

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