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Spark plug gap, important?

Polaris General Discussion

 
 
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Old 12-27-2007
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Default Spark plug gap, important?

Sparkplug gap, every machine states what the recommended sparkplug is as well as recommended sparkplug gap. Myself, I rip open the sparkplug box (NGK iridium if it matters) yank my sparkplug out and start threading it into the head. Yep you read that right, I skipped the gap part of the install. I always assume that the plug is gapped, if not perfectly close enough it shouldn't make a difference.

How important is sparkplug gap?
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Old 12-27-2007
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Well, since they get banged around in the box, I think that it's a good idea to check the gap on install.
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Old 12-27-2007
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You too huh? Heh.

Maybe if I fould plugs or raced I'd worry about it... for a well-functioning ignition system I don't think it makes that big of a difference if it's close. Difference of .035 vs .040 on my sleds? Who the fuck cares. Like I said I don't foul plugs and my machine isn't lacking in the HP dept.
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Old 12-27-2007
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I don't mean to hijack a thread about sparkplug gap, but I have a different plug question. Has anyone ever run indexing washers on their plugs so that the open gap of the plug faces the intake port? I know Shadetree sells indexing kits, and some ignition experts swear by this. Do you think that makes any difference?

I don't gap my plugs, because I usually screw them up and make something worse by bending it all cockeyed.
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Old 12-28-2007
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^^ I've also wondered about those indexing kits. Maybe madcow has an opinion on them?
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Old 12-28-2007
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A spark plugs’ tip temperature and the voltage necessary to fire the plug are directly affected by the gap setting. Most manufacturers set the gap from the factory for that plugs most popular application. Unfortunately, that plug may have hundreds of applications from snowmobiles to golf carts. Setting the gap for your particular engine is important as insufficient spark plug gap can cause pre-ignition, detonation and even engine damage. Whereas too much gap can result in a higher rate of misfires, loss of power, plug fouling and poor fuel economy. Even if the preset gap is supposed to match your motor, it is always best to physically check that the gap is adjusted properly for your motor prior to installation as the gap may have been changed during shipping.
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Old 12-28-2007
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^^ Very nice post!!
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Old 12-28-2007
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Quote:
Originally Posted by PolarisRich View Post
A spark plugs’ tip temperature and the voltage necessary to fire the plug are directly affected by the gap setting. Most manufacturers set the gap from the factory for that plugs most popular application. Unfortunately, that plug may have hundreds of applications from snowmobiles to golf carts. Setting the gap for your particular engine is important as insufficient spark plug gap can cause pre-ignition, detonation and even engine damage. Whereas too much gap can result in a higher rate of misfires, loss of power, plug fouling and poor fuel economy. Even if the preset gap is supposed to match your motor, it is always best to physically check that the gap is adjusted properly for your motor prior to installation as the gap may have been changed during shipping.
DANG!!! Now I've got to check mine.
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