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Old 09-03-2020, 01:50 PM   #1
modela4shane
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Default Bosch blue coil in a v8 ??

Can anyone shed a little light on the use of the Bosch blue coil #00012 which is intended for use on a 4 or 6 cyl. engine. I read in some old posts that Bubbas ignition recomends this blue coil with a pertronix conversion and 12 volts. My guestion is, will this coil be OK even though the resistance is greater than 1.5 ohms. The blue coil specs at 3.3 ohms witch is good for a 4 or 6 cyl. engine. I have used a Pertronix coil with 1.5 ohms. and they seem to be junk after a period of time, my second Pertronix coil has just failed. Thank you for any help.
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Old 09-03-2020, 01:54 PM   #2
51504bat
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Default Re: Bosch blue coil in a v8 ??

Running a Bosch blue coil in my 8ba 12 volt no issues.
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Old 09-03-2020, 01:58 PM   #3
KiWinUS
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Default Re: Bosch blue coil in a v8 ??

Coils don’t know how many cylinders you have.
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Old 09-03-2020, 02:00 PM   #4
jrvariel48
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Default Re: Bosch blue coil in a v8 ??

Running one with a Mallory Unilite
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Old 09-03-2020, 02:10 PM   #5
19Fordy
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Default Re: Bosch blue coil in a v8 ??

Last year I installed the Pertronix 12V conversion kit required for my 1953 Ford Mallory distributor and used exactly what the Pertronix folks recommended just to avoid the problems you are facing.
For the Pertronix conversion kit I purchased , Pertronix told me to use the Pertronix chrome flame thrower coil # 4001 rated at 1.5 ohms. It does not use an external ballast resistor. So far, the system works great. They also make the 1.5 ohms coil without the chrome cover. It has a different part #.

I also have the same #00012 coil that you have and did not use it because I figured Pertronix must know what works best with their conversion kits.

Prior to this I had been experimenting with various coils at the advice of many Fordbarners to no avail.

Call Pertronix and ask what coil you should be using.
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Old 09-03-2020, 02:23 PM   #6
modela4shane
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Default Re: Bosch blue coil in a v8 ??

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So why does Pertronix offer coils in 1.5 for the v8s and 3.5 for 4 and 6 cyls. Why not make 1 coil for all if the ohms dont matter? Confusing
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Old 09-03-2020, 03:32 PM   #7
Black Fifty
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Default Re: Bosch blue coil in a v8 ??

I'm pretty sure that the 1.5 ohm coil is for 6 volt electrical systems and the 3.0 ohm coil is for 12 volt systems. I also understand that using copper core wires may cause problems with their electronics in the distributor.
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Old 09-03-2020, 03:41 PM   #8
19Fordy
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Default Re: Bosch blue coil in a v8 ??

Bubba and others have posted tons of very helpful info. on the effects of using 1.5 or 3.00 or higher ohms coils along with ballast resisters and the data to show how coil resistance and ballast resistors influence performance on electronic ignitions. Just as a point of info. you can use 1.5 ohm coils with 12V. systems. I am doing so right now. Here's some info.
https://www.fordbarn.com/forum/showt...tributor+coils

It would seem logical to me that the manufacturer of Pertronix would know what's best for their products. Now, when it comes to Mallory electronic ignitions, I am not so sure.
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Old 09-03-2020, 04:21 PM   #9
Jembow
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Default Re: Bosch blue coil in a v8 ??

Pertronix told me not to swap over my 1.5ohm coil into my VW cos that needs a 3ohm and it would fry the module. So the rating matters, take Pertronix advice.
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Old 09-03-2020, 05:08 PM   #10
40cpe
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Default Re: Bosch blue coil in a v8 ??

Less cylinders have more dwell time, increasing heat, and need more resistance. Pertronix tech told me that increasing resistance might decrease performance of the unit in higher RPMs which isn't a problem in most of our flatheads. He said the blue coil is OK with the Pertronix 1 ignitor. To me, it makes sense to run a little more resistance and take some heat off the coil and the ignitor.
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