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Ignition Discussions regarding control module (ICM), coil packs, spark plug wires and spark plugs.

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  #1 (permalink)  
Old 01-12-2010, 11:01 PM
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Spark Plug Gap

I know this get asked all of the time, and I tried the search...I'm getting continuous misfires after only a few months of installing new plugs. I want to put either TR6s or 103s in, but I'm not sure of the gap for either of them given my mods.

Thanks.
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Old 01-12-2010, 11:39 PM
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Most gap between .055 and .057 inches. .050 to .060 isn't uncommon.
The wider the gap, the hotter and quicker the spark will be.
The shorter the gap creates a longer more sustained spark.
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Old 01-13-2010, 12:21 AM
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But boosted, the higher the boost the narrower the gap must be or the higher the voltage/current (power) must be. So GM is confident that stock gap (0.060?) is good for the stock boost, but most people like a tad narrower (you know, we know more than GM! to have a larger buffer against boost or other related misfires.

Run as wide gap as you can get away with, big kernel gets more of the burn started at the time of the spark event, so a smaller one will take longer to get the burn started. Olds had 0.080" gaps on the HEI's for a few years in the 70's. Didn't last long.... hard as heck on coils.

"The slower the burn, the more time for things to go wrong...." some racer I can't recall who said it.....

Quote:
Originally Posted by fastech View Post
Most gap between .055 and .057 inches. .050 to .060 isn't uncommon.
The wider the gap, the hotter and quicker the spark will be.
The shorter the gap creates a longer more sustained spark.
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Old 01-13-2010, 02:34 AM
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Quote:
Originally Posted by ls1camino View Post
I know this get asked all of the time, and I tried the search...I'm getting continuous misfires after only a few months of installing new plugs. I want to put either TR6s or 103s in, but I'm not sure of the gap for either of them given my mods.

Thanks.
103s are too cold for a 3.4 pulley setup... try some 104s if not siome 606s if your still fouling em out.. I'd try the 104's first at .057 ish gap...
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Old 01-13-2010, 11:50 AM
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Quote:
Originally Posted by n0dih View Post
But boosted, the higher the boost the narrower the gap must be or the higher the voltage/current (power) must be. So GM is confident that stock gap (0.060?) is good for the stock boost, but most people like a tad narrower (you know, we know more than GM! to have a larger buffer against boost or other related misfires.

Run as wide gap as you can get away with, big kernel gets more of the burn started at the time of the spark event, so a smaller one will take longer to get the burn started. Olds had 0.080" gaps on the HEI's for a few years in the 70's. Didn't last long.... hard as heck on coils.

"The slower the burn, the more time for things to go wrong...." some racer I can't recall who said it.....
Yea, that pretty much nails it on the head. Run as wide a gap as possible without causing misfire or blow-out.
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Old 01-13-2010, 11:53 AM
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Quote:
Originally Posted by ls1camino View Post
I know this get asked all of the time, and I tried the search...I'm getting continuous misfires after only a few months of installing new plugs. I want to put either TR6s or 103s in, but I'm not sure of the gap for either of them given my mods.

Thanks.
Your set up isn't much different than mine. I'm running 104's gapped to .057.
I've back cut and rounded groundstrap edges with no problems now for at least 10K miles. Seems to have a "crisper" spark when back cut. These have to be replaced more often.
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Old 01-13-2010, 01:39 PM
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I used to do that on my 455 Pontiac... I got around 12k on them on the stock HEI.

The older design of the Rapidfires had a good design, but not great plug life.

Quote:
Originally Posted by fastech View Post
Your set up isn't much different than mine. I'm running 104's gapped to .057.
I've back cut and rounded groundstrap edges with no problems now for at least 10K miles. Seems to have a "crisper" spark when back cut. These have to be replaced more often.
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Old 01-13-2010, 03:08 PM
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so then for my mods bin the sig. ur saying little bigger than .06 gap? (newbie question but hey thats how i learn)
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Old 01-13-2010, 03:18 PM
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No, stay .060 or lower on your application.
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