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On 29 Nov 2001, at 10:18, Mark Fuhriman wrote: > Hi Jim, I sent that dead Bosch Mexican coil to you this morning. It > had been in use for less than a year when it crapped out on the > freeway last summer. The primary winding is shorted. I shook it and > noted some sloshing noise. I also shook an old (presumably German) > Bosch coil that I recently acquired. No sloshing from that one. > > If you cut it open, I'd like to hear about what you find and why you > think it might have died. I cut it open last week and here's what I found: The primary coil is fine, but the secondary is open. I haven't tried to dig down into the secondary to see exactly what happened, but everything looks to be in pretty good shape. Nothing showed signs of overheating. You're right. This Mexican Bosch Blue coil sloshed when shaken. I also have a Bosch Blue coil made in Portugal which sloshes. All the rest of the OE can Blue coils that I have here are silent. I also noticed that this coil has an alum can. ALL the others I have are steel. I don't think this makes any difference, however. Your coil was filled with transformer oil. The primary is wound in several layers in a paper roll about 1" dia and 3" long. The secondary is MANY layers, about the same length, ID about 1/2" and OD just under 1". The magnetic core consists of about 2 dozen strips of steel, 1cm wide, 4" long, and 0.5mm thick. There is a molded plastic piece in the bottom of the can which supports and centers the coil within the can. Other than this plastic part and the oil itself, no other part of the transformer is closer to the can than 1/2" I'm curious about how the construction of the OE Bosch coils differs from the Blue coils, so if anyone has a dead OE coil that they'd like to donate, please let me know. My thanks to Mark Fuhriman for donating this one. ;-) - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/