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Old 05-30-2005, 12:56 PM   #1
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Default Plug Gap

I need to know the plug gap for some TR55s [one range colder than stock], with the Delco Ignition and Accel Aftermarket [DIS] Coils.


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Old 05-30-2005, 05:49 PM   #2
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On your car go with .060

.055 or so would be for the SC'd guys.... Us NA'd guys need to stick with the .060

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Old 05-30-2005, 06:23 PM   #3
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Hmm.. that'* interesting. No wonder my car wouldn't fire with .055" gap, but did a little better with .060." But then actually started with the old rusted *** plugs. Amazing isn't it? How old plugs can go through so much ****, and still work, but new one'* can't hold up to the heat?


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Old 05-30-2005, 08:34 PM   #4
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Shoot mine ran with .040 gap until i checked it. Doesn't run any different with .055. But that'* recommended so i'll stick with it.
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Old 05-31-2005, 11:23 AM   #5
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Quote:
Originally Posted by alec_b
Shoot mine ran with .040 gap until i checked it. Doesn't run any different with .055. But that'* recommended so i'll stick with it.
Isn't the 87 Vin 3 suppoised to have a .045 gap?

I'm forgetting....

All NA'd 3800'* should have the .060 plug gap....

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Old 05-31-2005, 01:35 PM   #6
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I would only use .060" (Rapidfire #14) with a Delco ignition. .045" (Rapidfire #3) with a Magnavox.
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Old 05-31-2005, 02:31 PM   #7
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Well i'm running the .05-.055 gap with the magnavox and it seems to run a little smoother than with the .040 gap previously. Could all be in my head though.
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Old 05-31-2005, 04:37 PM   #8
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Well I know that opening the gap will tend to retard the spark slightly (no idea how much) and require a hotter spark to fire so the gap will make a difference.

That said, I would not trust the Magnavox over .045" but that is personal. YMMV.
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Old 05-31-2005, 05:19 PM   #9
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I had mine at .060" and I had a really shitty spark [at the coils, not plugs].

If you say that a larger gap retards the spark, does a smaller one advance it? What if I were to gap my TR55s at .045" and cut the tip off [exposing the electrode]? Would that make a difference in anything?

*NOTE* I know exposing the electrode decreases the life of the spark plug significantly, but it'* all in the name of power.. and besides how many miles could it kill off one? They seem to 'work' forever in a properly running engine. My old ones are a testimate to that.


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