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Old 07-16-2002, 08:41 PM   #1
Scooby Newbie
Member#: 1663
Join Date: Jun 2000
Location: Haverhill, Ma
2000 Impreza RS

Default Plug gap questions

I was wondering what affect would gapping a plug to .049 on a 2000 RS. I heard some where in the past that a larger gap could increase performance but in turn reduce plug life. I've done a search and nothing came of it. So if anyone out there has any input on this matter feel free to drop your 2 cents......
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Old 07-16-2002, 09:58 PM   #2
Scooby Specialist
Member#: 9436
Join Date: Aug 2001
Chapter/Region: MWSOC
Location: My member# is lower than yours
05 Saab 9-5 Aero


A larger plug gap may increase performance if the cylinder is not firing properly due to mixture problems, etc. It will not help a cylinder that is already firing correctly. Look at it this way, If you only need a single small match to light that gasoline soaked wood in your campfire pit, it really doesn't matter if you throw a large piece of burning paper on it, it still lights and burns just the same, but the large piece of burning paper might be able to get damp wood burning when the match cannot.

As far as increased plug wear, yes, larger gapped plugs will wear faster due to increased firing voltage.

You should be albe to go .060"-.070" no problem with the stock coils and wires. If you need more than that, you have serious problems in your engine, and will get more power by correcting the mixture/cylinder filling/combustion chamber problems than you ever will with hot coils and big plug gaps.
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