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Old 12-12-2003, 09:39 AM   #1
imprezive
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Default Spark plug gap with mods.

My 60,000k tune is due and I wanna really do a thurough (sp?) So I wanna get the best spark plugs and gap them correctly.

My current engine mods are; (I'm not even sure this matters)
Cobb CAI
Cobb "street performer" cams
Borla headers
Custom cat section
Blitz nur-spec axleback section
Lightened flywheel

I don't claim to be an expert, but it seems logical to me that with a lot more air flowing in the engine you might use a different gap then stock. Please correct me if I'm wrong. I always desire to learn more.
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Old 12-12-2003, 10:15 AM   #2
White2.5GT
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I have a thread going like this as well...check it out.

http://forums.nasioc.com/forums/show...hreadid=467852
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Old 12-12-2003, 10:42 AM   #3
NicEJ25
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As far as I learn on tuning engine, by checking spark plug on 2 stroke engine (every other run while competing), the gapping work this way. smaller gap is a warranty of a spark in harsh contition (rich, oily, humid) but it is less powerful. Larger gap may cause misfire in harsh condition, but if it make a spark, it will be more effective. sometimes it's usefull, sometimes is doesn't make a change. like everything else, bigger is not better. if you do not have a good spark at each explosion phase, you loose power.
In your case, i wouldn't touch to the gap. if your modification make the EGT goes up, but not because the air-fuel mix is lean, it could be useful and safer to go one step colder spark plug
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Old 12-12-2003, 12:10 PM   #4
ommmjido
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honestly, i wouldnt bother messing with the gap on the spark plugs. but thats just me
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Old 12-15-2003, 12:25 AM   #5
Pengo
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keep the gap stock, no need to mess with it. even with the few bolt on's you have, there isn't that much more air going into your engine. now if you went FI, there would be need for colder plugs and smaller gap. you should be fine just where you are. unless you're getting misfires, don't change it from stock.
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Old 12-15-2003, 01:04 AM   #6
Tim Sanderson
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if you are reusing old plugs then you would want to check and adjust the gaps to get them into spec. But if you're going with new plugs then just check them and leave them(assuming oem replacement).

Good luck
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Old 12-15-2003, 02:20 AM   #7
imprezive
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well I get misfires sometimes on cold starts. I've had that problem eversince I got my cams.........
I just wanna get the best. I was thinking about the denso iridium plugs. BUT at the same time I don't want to just throw my money away.
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Old 12-17-2003, 10:29 AM   #8
imprezive
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bump
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