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Old 07-31-2019, 10:00 AM
Dave9111 Dave9111 is offline
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For reference; These are the picts from the internals of a failed Bosch PN 00012 "Blue Can" VW 4 cylinder coil. The Bosch blue coil is rather famous in VW circles. They are suppose to be ultra reliable and are rated at 3 ohms, although I have measured them to be slightly higher than 3 ohms.

This coil was on a Ford Tractor, but it is identical to another Bosch coil that I had fail on my Atomic 4. The tractor is exposed to rain and apparently some rainwater got into the coil.

This coils internals showed signs of water infiltration. It has a potted coil. Some say it is some type of epoxy but it seemed more like some type of stiff silicone rubber. The case itself is aluminum and the top was sealed (not well sealed apparently) by a rubber gasket. There was an iron or steel wrap around the core inside the aluminum case. You can see where rust has caused staining on the inside of the aluminum case from the corrosion of the

The Bosch coil I had on the Atomic 4 that failed worked for probably a couple of hours and then it would stop functioning and the engine would stop. If I let it cool off (it became very hot) it would work for a few minutes and then die again. I later tested this same coil on a bench top and it made a nice blue spark that would jump a 1/4" gap, so I have kept it, but it won't be used in the boat.

I wouldn't recommend using this coil on an Atomic 4 with the 1146 Pertronix ignition due to a heat build up issue.

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