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jhora jhora is offline
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Join Date: Jan 2001
Location: Derby City KY
Posts: 2,453
There always seems to be lots of discussion on this subject.
Maybe this will help...for is a picture of the "coils" Left to right are Bosch Stock OEM pulled from a 1969E w/CDS PN 0221121001 (Black color), Bosch current CDS model PN 0221121001 (Silver color) and the Bosch "Blue" PN 0221119027 (Blue color) Note size difference.

It appears that the Porsche factory made a distinction between the regular coil and the one for the CDS which they call an "Ignition voltage transformer" and the regular coil a "conventional induction coil". In the Porsche OEM shop manual page SL24 item #2 states "The ingnition voltage transformer cannot be replaced with a conventional induction coil. It cannot be be wired or tested as a coil"
Could this be the answer as to why so many of the CDS boxes have burned out. Using the wrong parts. Permatune also requires a special "coil" for their CDS box. It just seems that for some good reason the factory decided to use a diffrent "coil" for the CDS equipped cars. And I don't think it was just because they could charge more for the CDS "coil" As always you can use what you want...but just maybe....just maybe this is why many CDS have failed....summer heat...on the road....little heat from miss matched "coil" are now on the side of the road cussing the CDS box and thinking I should have bought that MSD box from Steve or our host....or is it you should have spent a few buck more for the "Ignition voltage trasnformer" and not used that pretty Bosch Blue coil...or the cool Red one with the internal balst resistor....
Just fuel for the fire.......

Old 10-13-2005, 07:32 AM
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