Need coil resistance readings - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-05-2005, 11:01 PM   #11
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MSD coils > stock coils for about 2 years apparently.
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Old 12-05-2005, 11:49 PM   #12
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Are the MSD'* giving you trouble? It'* hard to believe all three coils would be failing & have readings so close to each other. Maybe MSD used a heavier gauge wire in those coils.
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Old 12-06-2005, 12:01 AM   #13
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Compared to other MSD coils on this forum, I'm at half the typical resistance on the secondaries as others. That equates to a very low spark voltage if you know your transformer theory.
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Old 12-06-2005, 12:12 AM   #14
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You didn't say if they're giving you trouble. Isn't the voltage determined by the number of windings. If they used a heavier gauge wire & the same # of windings wouldn't the voltage be the same & the resistance lower?
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Old 12-06-2005, 10:18 AM   #15
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Well, my MSD coils are more than 2 years old. I bought them on Katie'* Birthday. Sept 10, 2003.

I'm going to fire off an email to MSD about them.

Quote:
Primary Resistance: 0.35 ohms
Secondary Resistance: 7.8K ohms

Maximum Voltage:
40,000 volts
Inductance: 4.2 mH
Turns Ratio: 80:1
(From MSD)
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Old 12-06-2005, 10:52 AM   #16
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Hmm, mine aren't bad, I don't think, but they don't jive with those numbers, either.
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Old 12-06-2005, 10:58 AM   #17
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Email sent. I'll post the reply when it comes (probably in a couple days). I measured mine when new, just need to find the topic.

Edit: Found this:

Quote:
Posted: Mon Aug 02, 2004 6:17 pm ........ All 3 coils are .5ohms on the primaries, 7.8k on the secondaries.
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Old 12-06-2005, 12:05 PM   #18
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3 is a long way from 7.8 in two years.
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Old 12-06-2005, 03:52 PM   #19
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That is the problem with MSD'*... That is why I always have said MSD coils looky good; OEM coils work. It is not worth the $$ and the minor performance you will get out of them if you have to replace the coils ever two years. If MSD would replace them after two year then it might be a diferent story but good luck trying to get them to do that. Willwren by chance do you know how many miles you have on them? I want to compare it to a few of my friends MSD coils that took a dump.
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Old 12-06-2005, 05:41 PM   #20
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Got about 20k on them. That'* pretty close.
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