Default MSD blaster coil popped 

Old 01-15-2020, 07:27 PM   #1
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Went to orient the Jeep under my lifting beam in preps to tear down the bottom end - no spark.
I just put a new dizzy in and set timing last week it was running fine. Was looking around and noticed everything kind of wet thought it was condensation as itís really humid.
Then a checked the wetness- itís a light oil. Look a little closer and the top of the coil is popped. Installed back in September/October. Only other thing Iíve done to affect it recently was remove the ballast wire


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Default Re: MSD blaster coil popped 

Old 01-15-2020, 08:37 PM   #2
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Wow thatís a trip


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Default Re: MSD blaster coil popped 

Old 01-15-2020, 09:53 PM   #3
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Quote:
Originally Posted by Basod View Post
Only other thing Iíve done to affect it recently was remove the ballast wire.
There's your root cause. I had the same result years ago after bypassing a failed ballast resistor.

 

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Default Re: MSD blaster coil popped 

Old 01-16-2020, 01:08 AM   #4
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First one I've seen.
Been run'n a MSD ign and coil for over 15 yrs now.
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Default Re: MSD blaster coil popped 

Old 01-16-2020, 11:28 AM   #5
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Quote:
Originally Posted by R717 View Post
There's your root cause. I had the same result years ago after bypassing a failed ballast resistor.
Yeah that's the first thing I assumed, though I was assured in the Team Rush upgrade the ballast wire could be eliminated.
Some web research claims that rotor phasing and poor ground from head to block can cause the coil to absorb the spark energy and overheat.
Ballast wire has been removed for a couple weeks but maybe 70-80 miles and some idling time while setting timing.

I'll double check all the ignition wiring and verify its not some intermittent deal where my ignition is not shutting off.

We'll see if NAPA honors a replacement on it

 

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Default Re: MSD blaster coil popped 

Old 01-16-2020, 03:11 PM   #6
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I have exactly 12.0 volts at my coil. What is your reading at the positive post?
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Default Re: MSD blaster coil popped 

Old 01-16-2020, 07:07 PM   #7
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Just a shade under battery voltage 12.3. It was 5.75 with the ballast wire. I never checked when running but Iíd assume 13.8 alternator voltage.
Ordered a new high vibration coil, be interested to see how warm it gets.


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Default Re: MSD blaster coil popped 

Old 01-17-2020, 10:09 AM   #8
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Quote:
Originally Posted by Basod View Post
Yeah that's the first thing I assumed, though I was assured in the Team Rush upgrade the ballast wire could be eliminated.
You may have to compare the resistance values on the primary side of both coils. The original coil may be ok while the msd flows too much current.

For context, my experience was with points on a sbc. I had the dwell maxed out for the most rpm potential.

 

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