Petronix II instalation question. 4.5 - Mercedes-Benz Forum

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post #1 of 23 (permalink) Old 12-26-2015, 05:26 PM Thread Starter
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Petronix II instalation question. 4.5

Hi All
I hope everyone had a nice Christmas. I was outside fiddling around with the points on my 4.5 and saw that the wire connection coming from the condenser through the body of the distributor was very bad and about to break, I have wanted to change over to the petronix and went ahead and ordered the 91885 unit. It looks straight forward to install. I am a little in the dark about ignition wiring etc. Do the wires from the new petronix unit go straight over to the coil? Red to Plus side, Black to negative? Also do I just remove that long green wire and the condenser together?
All the best John.
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post #2 of 23 (permalink) Old 12-26-2015, 07:28 PM
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John

Attached is a photo of my install in my distributor. Yes red and black go to coil. Green and ballast removed. I also removed my ballast resistor.
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post #3 of 23 (permalink) Old 12-26-2015, 08:37 PM Thread Starter
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Thanks TZ. How do you like the system? Also I see that some change out the coil, is that necessary? I still have the old bosch unit.
Cheers John.
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post #4 of 23 (permalink) Old 12-26-2015, 11:37 PM
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I just saw in your profile, that your w108 is a 904 blue with cognac interior.
My favorite color paint.
I would love to see some photos of the whole car.

Regards

Alex
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post #5 of 23 (permalink) Old 12-27-2015, 06:35 AM
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John. I went with the pertronix flamethrower coil. Love it compared to stock
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post #6 of 23 (permalink) Old 12-27-2015, 07:17 AM
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Alex. Purchased my car about 6 years ago. She was gold with tobacco but had been in a barn for 12 years following an engine fire. Good bit of rust. I did all the mechanical and welding of new sheetmetal up through primer. had a young guy starting a body shop paint it for me. Did interior myself.
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post #7 of 23 (permalink) Old 12-27-2015, 03:06 PM
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Just thought I should point out that Pertronix II should not be used on cars with low resistance copper wires. Pertronix state that right on their site. The Pert II unit will apparently not last long. Most of us with Benzes with copper wires used the 1885 Pertronix. This is link to Pertronix site - see paragraph in Red: Ignitor II

You can install just as points replacement (you keep your existing switchgear (ignition module) and coil. Or you can bypass switchgear and install a Flamethrower 1.5ohm coil. Important to get correct coil resistance so buying matching Flamethrower is recommended. Wiring for two options is quite different.

http://www.benzworld.org/forums/r-c1...witchgear.html

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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post #8 of 23 (permalink) Old 12-27-2015, 09:33 PM Thread Starter
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Hi Mb Graham.
I must admit that wiring gets me confused very quickly I recently changed out my spark plug wires for these.

http://www.autohausaz.com/pn/09027

Am I ok with this setup? Or should I change to the 1885?
Thanks John.
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post #9 of 23 (permalink) Old 12-28-2015, 04:17 AM
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In your link, Bosche "OE" seems to include a copper inner conductor. If so, then no, this is not the setup you want. Leave "OE" in the rear view mirror when using a Pertronix setup - the inner copper tends to act as an antenna, inducing voltages into the other wires. I know this from experience, and after calling the maker in a confused huff when my new Pertronix setup ran badly, I ordered the plug wires with carbon cores. They sell those as kits (VERY simple to setup and use), as do Summit Racing, Autozone, et al.
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post #10 of 23 (permalink) Old 12-28-2015, 07:02 AM
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Quote:
Originally Posted by wroding View Post
Hi Mb Graham.
I must admit that wiring gets me confused very quickly I recently changed out my spark plug wires for these.

Bosch 09027 Spark Plug Wire Set

Am I ok with this setup? Or should I change to the 1885?
Thanks John.
Those are the wires I have used successfully on my car along with the 1885 Pertronix for years. I have retained the MB switchgear wired in way shown in earlier post link.

The original (OE) wires had resistors at each end - 5kohms at plug end and 1kohm at distributor end (if memory serves me). The 09027 Bosch wires are I believe 1kohm. Assume the resistor is at plug end. For the 91885, Pertronix seem to be concerned about lack of resistance in the wire from plug boot back to distributor. And because Bosch wires have copper core this is essentially zero. (Would have to cut wire apart to prove this! Bosch have never given a straight answer)

I have some trouble with idea of putting in carbon core resistance wires which to some extent could defeat (or require) need for a higher voltage coil like the Flamethrower. But if it works for some, perhaps that is one option.

Seems a couple of guy have gone the route of carbon core wires with the 91885 while many have used the 1885 with 1kohm Bosch (or other similar) aftermarket wires. Your choice, I guess. Good Luck!

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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