Today's coil question

Nicad

Nicad

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Don't want to tire the E9 experts out with unending simple questions, but what colour was the original coil on an E9 of 71' vintage? Mine currently has a tired looking Orange top Bosch coil.
Is there a Good ,Better, Best type when it comes to Bosch coils?


Tia.
 
I am sure mine was original when I took it off - it was black but will verify tonight. I repaced with a higher output Bosch red one and kept the ballast resistor and added Pertronix, mounted a dummy condensor to keep it looking stock. Works well.


Nicad said:
Don't want to tire the E9 experts out with unending simple questions, but what colour was the original coil on an E9 of 71' vintage? Mine currently has a tired looking Orange top Bosch coil.
Is there a Good ,Better, Best type when it comes to Bosch coils?


Tia.
Click to expand...
 
Original was black and used a 1 ohm resistor. The current replacement is red with silver label or sometimes silver with red label, they use a 1.9 ohm resistor available from AutohausAZ for $28. Later cars got the blue coil with internal resistance.

Chris
 
You can determine the date of manufacture of the coil. Just about every Bosch item has a 3 digit date code stamped on it. On the coils it is usually on the bottom.

Starting in 1964, the first digit of the code is the last digit of the year. The last two digits represent the month of manufacture. So, for example, 912 is December 1969. From ´64 through ´69, the month is designated by 01-12. For the decade of the 70´s the months are designated by 21 through 32. So for example, 332 is December of 1973, or 023 is March 1970.

Hopefully this makes sense and you can determine if your coil´s birth date is on or before that of the car. Let us know!
 
Nicad said:
what colour was the original coil on an E9 of 71' vintage?
Mine currently has a tired looking Orange top Bosch coil.
Is there a Good ,Better, Best type when it comes to Bosch coils?
Click to expand...


Anecdotally: black case and orange top (matching orange distributor cap) is probably original to later models.

http://www.e9coupe.com/forum/showthread.php?t=9501 :wink:
Land_Range_Rover_Classic_Discovery_Defender_Ignition_Coil_PRC6574.jpg
fiat-ignition-coil-bosch-late.jpg
coil_resistor1.jpg
222216716_2221257807ffb8ed7da5686557808b1e03a389993dd2ab5a5.jpg
 
Cool - the code on my original one is 224 so according to this it's April 1972. Here's a pic of the coil - black with brown top:

IMG-20120410-00374.jpg



Luis A. said:
You can determine the date of manufacture of the coil. Just about every Bosch item has a 3 digit date code stamped on it. On the coils it is usually on the bottom.

Starting in 1964, the first digit of the code is the last digit of the year. The last two digits represent the month of manufacture. So, for example, 912 is December 1969. From ´64 through ´69, the month is designated by 01-12. For the decade of the 70´s the months are designated by 21 through 32. So for example, 332 is December of 1973, or 023 is March 1970.

Hopefully this makes sense and you can determine if your coil´s birth date is on or before that of the car. Let us know!
Click to expand...
 
Chris, am I running the risk of frying my Pertronix and/or my coil by running the stock ballast resistor? It's been over a year and several long trips with no issues and starts right away on first crank.


HB Chris said:
Original was black and used a 1 ohm resistor. The current replacement is red with silver label or sometimes silver with red label, they use a 1.9 ohm resistor available from AutohausAZ for $28. Later cars got the blue coil with internal resistance.

Chris
Click to expand...
 
Steve,

After several years I have had no issues. But, my points would only last 7k miles so i went with the Pertronix and may switch the ballast to 1.9 which has a reddish bracket. However, on my 2002 I had the red coil and stock resistor and my ignition would cut out, sometimes after a long time. I switched to the 1.9 and have had no issues, it still has points. If you still have Black you should be good
 
I didn't have the time to remove the coil, but wondering where the Blue/Orange top fits in? I also do not see any Ballast resistor under my hood. Could this one have the resistor built in and is there any advantage to this? BTW,( I have installed a Pertronix and the car was barely running when I started taking things apart in the fall)

P1060850.jpg
 
Blue is all you need, it's internally resisted. Your coupe would have come with a black coil and resistor originally.
 
I have the same setup as "Stevehose" without any issue. I'm keeping the ballast resistor in the trunk toolbox in the event of a "hiccup".
 
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