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Registered
Join Date: Feb 2008
Location: Alberta, Canada
Posts: 455
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Question to the CDI(6 Pin) Gurus!
Hello Everyone!
 Got a used CDI. Was told that it worked. I never tried to run it yet. But was curious what was on the inside.  Took the cover off, and one wire/strap fell apart in front of my eyes... 31/1 Looks like it was burnt, or something...    Would a simple replacement of the wire fix this whole thing? Thank you very much!!! Gene |
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06-08-2010, 09:57 AM
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The 31/1 is the ground. Something shorted like one of the diodes possibly. Do a search on Warren Hall. Warren posted a great thread on the CDI's years ago and will provide you with lots of information. There are some other good posts on CDI's here with Pelican.
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Mark Jung Bend, OR MFI Werks.com |
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06-08-2010, 10:07 AM
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Contact this company. I've heard they are the experts on rebuilding these CDI boxes:
Systems Consulting...Automotive Electronics Marc |
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06-08-2010, 10:51 AM
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Registered
Join Date: Feb 2008
Location: Alberta, Canada
Posts: 455
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Thanks a lot guys!!!
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06-08-2010, 11:04 AM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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Here are a few classics with great information.
History of Bosch CDI ... toubleshooting info, parts list changes, and schematics ... 6-pin SC/Turbo CDI unit repair documentation FYI - that was my dead CDI that lived for the documentation. Warren was such a great member of this board.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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06-08-2010, 11:40 AM
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Registered
Join Date: Feb 2008
Location: Alberta, Canada
Posts: 455
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Now I remember where I have seen that name! At the top of the forum!!!
Too bad Warren is no longer with us! He will be missed!!! |
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06-08-2010, 12:57 PM
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These Bosch CDI units can be rebuilt. Pelican Parts (our host) amongst others are offering this service.
The internals are a DC/DC converter, a trigger circuit and a SCR switch. The DC/DC generator charges the internal main capacitor to around 400V-450V. The trigger circuit evaluates the VR (variable reluctance) signal from the distributor and generates a sharp spike-shaped signal for the SCR. It is a pulse-shaping stage. On the 6 pin it also generates the tach signal. The SCR switches that charged capacitor to the ignition coil which acts as a transformer. It transforms the voltage by a factor of x1000 to 40,000V. A spark is generated and the SCR disconnects the coil from the capacitor. Then the cycle starts again. That is in essence how the CDI (capacitive discharge ignition) works. As others said there is a lot of good information out on the board. Warren posted several Bosch manuals and circuit diagrams. Unfortunately, some have mistakes but overall it is pretty well documented. Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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06-08-2010, 01:32 PM
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My bet would be that the 31/1 printed circuit connection was faulty, poor soldering, and the resulting heat buildup melted the connection.
Replace the connection and be done with it. |
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06-08-2010, 03:31 PM
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Registered
Join Date: Feb 2008
Location: Alberta, Canada
Posts: 455
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wwest I like your style!!!
If I do, and it doesn't fix the problem. The rest of the car's components will be fine? Thanks!
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06-08-2010, 08:23 PM
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1957 Porsche 356 A Coupe 2.7 Short Stroke
1972 Porsche 72 Coupe
Porsche 911 C2S
1974 Porsche 911 Targa 3.6
Forever
Whatever
Fasst
