Blue coil Bosch

N

normren

BANNED
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
 
4, 6, or 8 cylinders makes no difference on a coil or even condensor for that matter. A typical V8 from later years like a SBC, or a mallory distributor, SBF etc operate on around 28 degrees of dwell and the 00012 coil would have too much resistance to provide a hot spark. On the 32-48 Fords however the run on 36 degrees of dwell and have a longer coil charge time and require less amperage to create a hot spark. The total primary resistance on a Early Ford 6v from the factory is 1.6 ohms. When you double the voltage and go to 12V you need to double the resistance (so 3.2 ohms or close to it). Any much more and you'll have a weak spark. Too much less and the points will pit and burn up prematurely.

This is what makes the Bosch coil ideal. It is the correct resistance, and in the 00012 case it is epoxy filled so it can be mounted in any position and is better suited for heat.
 
There are a lot of different “blue” Bosch coils some with a very low primary resistance for some electronic ignition systems.
One listed for a 1972VW beetle would be ok, One listed for a 1972 Mercedes won’t
The VW one doesn’t use external resistors,the blue mercedes one does
 
It is my understanding that the BERU ZS 172 coil can be used as a replacement for the Bosch 00012 coil. I have a BERU for sale, if anyone needs one. Thanks, JIM
 
19Fordy said:
It is my understanding that the BERU ZS 172 coil can be used as a replacement for the Bosch 00012 coil. I have a BERU for sale, if anyone needs one. Thanks, JIM
Click to expand...
ts.com%2Fcatalog%2Fimages%2FSUPERSTOCK%2Fzs172-int.jpg
 
And here I thought a bosch blue coil was just a bosch blue coil. Now I better go look at what I have on all my trucks.
 
Yeah, I would never install a coil without putting an ohmmeter on it to verify what I have. Some vendors selling coils list the resistance. Most don't tell you.

Follow this from Michael's post# 3:
"The total primary resistance on a Early Ford 6v from the factory is 1.6 ohms. When you double the voltage and go to 12V you need to double the resistance (so 3.2 ohms or close to it)"
 
The primary resistance on the BERU COIL ZS 172 is 3.3 ohms.

The primary resistance of the BOSCH Blue Coil is 3.5 ohms.
"This genuine Bosch coil has a primary resistance of 3.5 Ohms, so it will work with conventional points and condenser, or most simple electronic ignitions like Compufire or Pertronix."
 

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19Fordy said:
The primary resistance on the BERU COIL ZS 172 is 3.3 ohms.

The primary resistance of the BOSCH Blue Coil is 3.5 ohms.
"This genuine Bosch coil has a primary resistance of 3.5 Ohms, so it will work with conventional points and condenser, or most simple electronic ignitions like Compufire or Pertronix."
Click to expand...
574449
 
So, in the future it would be best to run the Beru? What are the implications of running the bosch that so many of us have?
 
19Fordy said:
GB: Here's some info. on the differences in running a BOSCH or A BERU Blue coil.
It looks to me like the BERU is a better made coil.
https://www.bing.com/search?q=diffe...NIBCTE2MzQzajBqNKgCCLACAQ&FORM=ANAB01&PC=HCTS
Click to expand...
Here are the key differences between Bosch Blue Coils and Beru Blue Coils:



Performance: Beru coils are designed to provide a quick engine start and long service life, while Bosch coils may have declined in quality over the years.

Customization: Beru coils can be customized based on specific parameters, such as energy output, which may suit different vehicle needs.

Cost: Beru coils are generally more economically priced compared to Bosch coils, which can be more expensive due to their higher quality and manufacturing processes. These differences can help you choose the ignition coil that best fits your vehicle's requirements and performance needs

 
I bought a Beru, VW application with 3.3 Ω resistance after I removed a Petronix. It ran hot for me. I replaced it with another, maybe Beru coil, that has ~1.4 Ω internal resistance and also run it in series with a ballast resistor.

I painted the case of this replacement which was blue with part number 0515 on the bottom and lost the receipt with info. Anyone know of it?

574465
 
19Fordy said:
The primary resistance on the BERU COIL ZS 172 is 3.3 ohms.

The primary resistance of the BOSCH Blue Coil is 3.5 ohms.
"This genuine Bosch coil has a primary resistance of 3.5 Ohms, so it will work with conventional points and condenser, or most simple electronic ignitions like Compufire or Pertronix."
Click to expand...


Well, I guess it depends on which Petronix unit you have. I forget the model I have but it says repeatedly in the directions to use a 1.5 OHM coil.
 
Yes, that is the resistance, 1.4-1.5 Ω, of my mystery coil that Buba supplied with the Petronix.

574466
 
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