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Old 04-29-2010, 07:09 PM   #1
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SP 463 plugs

Just wanted to know what Everybody thats running Plugs SP463 are gapping them to?


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Old 04-29-2010, 07:11 PM   #2
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I gapped mine at .035 and that was with nitrous
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Old 04-29-2010, 07:26 PM   #3
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I believe ive got mine gapped at .030
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Old 04-29-2010, 08:39 PM   #4
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I am going to try .040 with my JRSC setup...see if the MSD coil and MSX 90 wires can hold up. I think i had .035'ish on my last set.
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Old 04-29-2010, 08:41 PM   #5
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depends on how much boost you are running, I gap mine at .030 on 20psi.
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Old 04-29-2010, 08:44 PM   #6
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i dont mean to thread jack. but what is the reason for a smaller gap on boosted cars?

mine is .035
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Old 04-29-2010, 08:49 PM   #7
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So you dont blow the spark out
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Old 04-29-2010, 09:02 PM   #8
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I knew that much but why does that happen with boost. Im looking for the science of it i guess.
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Old 04-29-2010, 09:13 PM   #9
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A large amount of air is rushing into the cylinder. That high speed, high density air blows out the spark similar to wind blowing out a candle. Think of cupping your hand around a candle as similar to reducing the gap on a spark plug
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Old 04-29-2010, 10:40 PM   #10
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It is not at all like blowing on a candle.

The real reason is the breakdown voltage of air is higher at higher pressures, so you have to make the gap smaller to lower the voltage required for breakdown.

Paschen's Law if anyone is into wiki-ing. http://wiki.4hv.org/index.php/Paschen%27s_law


I want to thank FiFoci for being so persistent otherwise I might not have ever realized this.
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