Pertronix 40001 Flamethrower Coil 40,000 VOLT 1.5 OHM

[Andrew S]

Hi All

I have the Pertronix LU-187 ignitor fitted but thinking of adding a Pertronix 40001 Flamethrower 40,000 VOLT 1.5 OHM coil,

Am I correct in thinking this is OK with the Stags ballast and voltage set up when running?

Anyone fitted one? Any good?

[trunt]

The 40001 seems to be correct for the pertronix1. But may be incorrect for pertronix2. However the instructions seem to say that for a ballast system you need to use the 0.6 ohm coil, or bypass the ballast..

https://cdn.shopify.com/s/files/1/0247/6913/4628/files/40001.pdf

[Andrew S]

Thanks, interesting

Not sure whether LU-187 is a Pertronix 1 or 2 then ?

Found this on Google

The Ignitor should be used with coils of 1.5-ohm resistance or greater, while the Ignitor II can benefit from higher-powered, super-low-resistance coils. PerTronix offers Flamethrower (40,000 volts) and Flamethrower II (45,000 volts) coils to go with the Ignitors, though other brands can be used.

[trunt]

Lu181a is an ignitor1. 9lu-181 is an ignitor2. They definitely recommend bypassing the ballast (**edit - not quite). However I think some are using it with ballast but probably with the original ballast coil..

[Andrew S]

Thanks, any ideas what version the LU-187 is as mine isn’t a 181 model
Much appreciated

[trunt]

All I can find on the lu187 is from 10 years ago.. it may have been superseded by the lu181??

[sujitroy]

All I can find on the lu187 is from 10 years ago.. it may have been superseded by the lu181??

I have the lu181 on my Stag from a few year back. The 9lu-181 has some protection device in it so you can keep the ignition on without the engine running.
Sujit

[Wheelz]

Looks like the LU187 is the basic Ignitor which is suitable for use with the Ballasted system (1.5 ohm coil + ballast resistor).
The 1.5ohm 40001 seems to be suitable, and there is also another 1.5 ohm coil but epoxy filled, the 40111.

Pertronix Performance Ignition Parts - Superior Performance- at Norfar - NORFAR.COM

[Andrew S]

Thanks all

Thanks Chris. So, in your opinion could I fit either coil without modifying the ballast?

Cheers

[Wheelz]

Thanks all

Thanks Chris. So, in your opinion could I fit either coil without modifying the ballast?

Cheers

Yes, either will be OK. The 1.5 ohm coils must be used with a ballast otherwise they might take too much current and overheat. If the ballast had been bypassed the 3 ohm coils would be the ones to use.

There are claims that epoxy coils are more reliable than oil filled, but I don't know if that's true. But note that oil filled fitted should be kept upright.

[Andrew S]

Thanks Chris
Interesting
Much appreciated

[trunt]

If you are keeping the ballast I would agree with Chris on the 1.5 ohm coil to be safe. The instructions do show that the pertronix should be fed a full 12v before the ballast which is difficult in a Mk2 with the resistance wire, then again it also works with 6v!!


Strange, That I can’t I find lu-187 on the pertronix website? All I get is a ml-187 for Mallory dizzy.

[trunt]

Yes, either will be OK. The 1.5 ohm coils must be used with a ballast otherwise they might take too much current and overheat. If the ballast had been bypassed the 3 ohm coils would be the ones to use.

Chris, Take another look at that link I posted on the coils. 1.5 ohms for 12v 8 cylinder and 0.6 ohms for 6v 8 cylinder. I am using a 1.5 ohm without ballast as per instructions and it’s fine.

https://cdn.shopify.com/s/files/1/02...iles/40001.pdf

[trunt]

And another thing...

With a ballast system you are taking a setup designed for 12v operation (pertronix and 1.5 ohm coil) then when you let go of the start key halving the voltage.. just eliminate the ballast, you already have a fatter spark now and the "boost" is no longer needed.

[DJT]

And another thing...

With a ballast system you are taking a setup designed for 12v operation (pertronix and 1.5 ohm coil) then when you let go of the start key halving the voltage.. just eliminate the ballast, you already have a fatter spark now and the "boost" is no longer needed.

That was the recommendation from the Distributor Doctor. I have taped up the resistor wire, white/yellow and white/slate wires and stuffed them behind the insulation pad. A new 'clean' 12v wire fed from a fused supply to the Pertronix Flamethrower 40111 coil. Pertronix unit mounted inside the dizzy. I carry a known good Lucas Sport coil in the boot and could swap back to OE ballasted system if necessary.