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Unread 03-28-2015, 04:05 PM   #1
Teslein
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Side gapping spark plugs?

Anyone ever experiment with this? I was trying different spark gaps and found a generous 0.07 gap ran the best. Trying to search for others who have tried a large spark gap brought up results for something called side gapping. They cut the ground electrode back to unshroud the center electrode. The theory seems to be by unshrouding the spark it results in a quicker and cleaner burn. I can't see how that would be the result. Maybe I'm wrong, but wouldn't doing this simply result in more reliable spark by exposing it more to the air/fuel mixture?

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Unread Yesterday, 02:53 AM   #2
kg6mov
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Methinks you would need to index them for that to have an effect. Seems like a lot of work for not a lot of gains.
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Unread Yesterday, 05:51 PM   #3
HighLonesome
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I've tried sidegapping plugs a few times. Pretty sure it's worth a touch of extra power, but not much. The plugs don't last when you do this because the wear surface of the ground electrode is reduced. But who cares with cheap plugs and they are easy to swap in ZJs. If you care about an extra HP or two and probably a little better mileage, then I don't think it can hurt. It's extra work and you will be needing plugs more often, so you got to factor that in.
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Unread Yesterday, 09:01 PM   #4
Cbob4
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And the question is, when in the powerband will that extra 3 HP be realized? At 5K RPM?
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Unread Yesterday, 09:23 PM   #5
HighLonesome
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Originally Posted by Cbob4 View Post
And the question is, when in the powerband will that extra 3 HP be realized? At 5K RPM?
You're exposing the spark more to the combustion chamber at all RPMs so I would guess the small gain is across the board.
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Unread Yesterday, 09:42 PM   #6
Hexonut
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I run AC Delco, they are the best plug I've found for my 4.0

A 3HP net could be anything like the slight difference the testers foot applied the gas pedal on that particular dyno run.
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