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Join Date: Oct 2003
Location: Bremerton, WA
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3 pin 77 cdi
Is there a home test that you can do to insure the box is working properly? 3 pin cdi out of a 77 911s
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10-19-2005, 01:24 AM
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There has been a Bosch manual posted as jpg:s here on the BBS. Try the search to locate it.
You will probably have to be somewhat electrically inclined and have some equipment to do it.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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10-19-2005, 08:19 AM
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Does it still "whine" when you turn the key on? BTW, I'm looking for a rebuildable core if you decide to go the MSD route...
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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10-19-2005, 09:22 AM
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Work in Progress
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What does a CDI look like?
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB -Marine Blue '87 930 |
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10-19-2005, 09:34 AM
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The square finned box located on the left fender of the engine compartment...has wires leading to it, Capacitive Discharge Ignition, made by Bosch...
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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10-19-2005, 09:40 AM
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HTH
Alan.UK 
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10-19-2005, 11:38 AM
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Have you seen your CDI bay-be...hiding in the shadow?
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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10-19-2005, 12:46 PM
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actually It worked when I removed it a few years ago but I was going to sell it and I wanted to insure it worked I will search the site for those bosch manuals
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1983 911SC 1977 911S "parting out" |
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10-19-2005, 12:58 PM
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The only proper way to bench-test is to hook it up to +13.8Volts, hook up a coil with spark plug and a signal generator that simulates the trigger signal. Let it spark at various simulated RPM's between idle and 6000RPM for at least an hour (it needs to come up to operating temperature). It should work for voltages between 12.0 and 14.8 without latching up. Check if current consumption is within the specified range around 1.00 Amp without sparks and between 2.2 and 2.6 Amps with sparks.
While it sure is broken if it does not whine just the whining alone does not mean the box is functional. 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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10-19-2005, 01:01 PM
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The easiest would be to put it back in a car and use it for a while. Itīs an easy swap.
Then you would be 100% sure that it works.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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10-20-2005, 12:07 AM
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Starlifter: PM me your email if you donīt find the manual, I found the pictures on my harddrive so I can mail them if you want.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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10-20-2005, 12:19 AM
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I put a MSD box in over a year ago and then totalled it so I dont have a car to test it in I actually want to sell it but just want to insure it still works
starlifter1@comcast.net
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1983 911SC 1977 911S "parting out" |
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10-20-2005, 08:48 AM
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Location: TX USA
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Here are the threads with documentation of the 3-pin CDIs:
Perma-tune CD or Bosch CD? History of Bosch CDI ... toubleshooting info, parts list changes, and schematics ... I haven't posted any updates to the latter thread recently due to a 23-day stay in the hospital ...
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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10-20-2005, 09:02 AM
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Location: Linn County, Oregon
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Warren...23 days? Man, that had to be something serious! I hope you're okay now. I've done a similar stretch...hospitals are great when you need them, but they're even better to be OUT of!
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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10-20-2005, 09:34 AM
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1977 Porsche 911 Targa 2.7s
Bruiser
1974 Porsche 911 Targa 3.6
