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#1
10-03-2012, 10:33 PM
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Defective Blaster 2 coil
I have a defective Blaster 2 coil. It is ancient; old enough to say "Made In USA" molded into the top.
The coil still makes sparks, but low-voltage; the spark won't jump a proper gap. Replacing this coil with an even-more-ancient original GM coil restores decent spark--the GM coil will now throw a spark three or five times as far as the defective MSD coil, although perhaps not as far as the MSD coil prior to it becoming defective. There's no question that the MSD coil is currently defective. My question is: What can cause a coil to lose power yet still be very close to published specs for resistance tests? Primary resistance of my defective coil: .6 ohms. Published spec is .7 ohm. Secondary resistance of my defective coil: 4.25K ohms. Published spec is 4.5K ohm. I'm thinking internal short--the coil windings are OK, but the spark is shorting from windings to the inside of the case of the coil instead of being directed to the coil wire terminal. What do you think? 
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#2
10-04-2012, 06:57 AM
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was it mounted up and down or on its side?
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#3
10-04-2012, 07:34 AM
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Mounted up and down...in an MSD spark-testing display.
Spent it's whole life being punished by enormous air gaps while it tried to "make lightning". Chrysler was good for mounting oil-filled coils on their sides--millions of 440s were set up that way from Mother Mopar. Not me, though.
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#4
10-04-2012, 09:35 AM
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sounds like a break or short in the internal bobbin .
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#5
10-04-2012, 09:39 AM
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Quote:
I'm tempted to "disassemble and inspect" just for giggles.
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#6
10-04-2012, 12:33 PM
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it's either arching internal --( bobbin...).or a break in the windings.
bobbin+coil.JPG
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#7
10-04-2012, 03:07 PM
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Quote:
Thanks for the photo, I wasn't sure what the inside would look like. Have not yet cut the crimped metal band and looked inside.
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