Bosch Blue Coil

De Quincey,

before i answer your question, i need to ask a question ... would this coil work with a 3.5 injected engine with l-jetronic?

scott
 
thanks Luis, i think this would say that my coil came from Brazil. according to this description, the coils made in spain had a tan cap ... and singular spade connector tabs. of course, i have no idea if older or newer brazil coils would make a difference.

so my question remains - do these work with an engine with l-jetronic or no?
 
will that work ?

hi scott

i have no accurate answer to your question

the only thing i can say is that the blue manuals specifically says to use that coil on carbureted engines ! and never use the other number that is intended for EFI engines

i only can assume that the contrary can be said, so dont use a "carburated" coil in an EFI engine

but as i might appear like an interested part:twisted: in this issue you´d better ask the "experts" (all heads turn to jerry !) :-D
 
read it in the blue books

scott, according to the book, you may not use that coil in your efi engine, read the second paragraph (the CAUTION sign):

bobinas.jpg
 
My L-jet equipped 76 3.0 Si came with the black coil and a .9 ohm resistive wire in the harness. These E3's didn't yet come with the optically triggered electronic ignition of later cars. After researching this I decided on a black coil with the called-for 1.8 ohm resistor (it's indicated on the coil label) for my E3. The car is not yet running some can't comment on performance.
 
this was my setup

i can not tell if this was absolutely original, but this was what i found in my car:

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bosch symbol, plus made in germany, plus tan bakelite cap

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027
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resistor
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Ho boy

I have run my car with the 027, yet I have no resistor in the loop. Odd, all my coils on the shelf show from 1.9 to 2.2 ohms including the 027. Drove today, no issues, pulls very nice. Enough power to make the bride uncomfortable....she drives a Turbo Volvo wagon....V70 XC so that says something. I am at the point now that if it ain't broke I do not fix it. The E9 is a pleasure cruise for sure. My car will bark to life with a breath on the key and runs from cold start to road and operating temp with nice idle, mid- range, and full on without a hiccup. Trouble with this hobby....never know when to quit.
 
pamp said:
I have run my car with the 027, yet I have no resistor in the loop. Odd, all my coils on the shelf show from 1.9 to 2.2 ohms including the 027. Drove today, no issues, pulls very nice. Enough power to make the bride uncomfortable....she drives a Turbo Volvo wagon....V70 XC so that says something. I am at the point now that if it ain't broke I do not fix it. The E9 is a pleasure cruise for sure. My car will bark to life with a breath on the key and runs from cold start to road and operating temp with nice idle, mid- range, and full on without a hiccup. Trouble with this hobby....never know when to quit.
Click to expand...

let me try to understand

you run a 027
no resistor
and you have an original setup with zeniths
and breaker points in original distributor ?

how long do your points last ?

regards
 
Do not use an internally resisted blue coil with a ballast resistor or a resistor wire, you are reducing the spark. Just get rid of resistor if you want.
 
To De Q

I have a 3.3 motor, D-jet conversion done back in the 80's. I run Pertronics in the dizzy. Vacuum advance. How would one tell if perhaps I have a resistor wire? I see no indication of this and believe me I have had this car apart virtually to the nuts. Yet nothing suprises me...
 
Running Pertronix with the crappy coil

I stole the attached picture from pamp...I have the coil on the left (did not buy it but it came with the car). The resistance measured across the positive to negative terminals is 3.4 ohms.

Would this coil require the external resistor to operate without damage to the Pertronix or should the external resistor be removed?

Seems like a coil with high resistance across the terminals (3.4) would not require the external resistor versus a coil that only measures 1-2 ohms across the terminals.
 

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That seems to make sense. Do you have carbs or EFI?

So I'm totally confused now. I put a Petronix system on my '72 D-Jet 3.0 and left everything, including the coil, totally alone. OEM except the Petronix. Am I going to burn something up (hasn't yet) or am I shorting myself on performance?
 
Hey Bwana, sorry for the delay.

I am running dual Webers.

Planning to purchase a new coil since mine is apparently the one least desired. Currently running pertronix without the external resistor. When I purchased the car the external resistor was "in the loop" however after reading this post about my coil having the lowest voltage output, and with resistance across the terminals of 3.4 I removed the external resistor.

So far, no issues.
 
WHere did you get the bracket? I am going to have some parts Cad plated, but I guess this bracket was originally in this finish?
 
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