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Evo General Discuss any generalized technical Evo related topics that may not fit into the other forums. Please do not post tech and rumor threads here.

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Old Jan 27, 2011, 09:29 PM   #1
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Gapping the spark plug

i will be replacing my spark plugs soon with the same NGK BPR8ES that i have on there right now.
I will be installign FP black running pump gas and i was wondering at what length do i gap these things?
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Old Jan 27, 2011, 09:40 PM   #2
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.22 .23 if i'm not mistaken
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Old Jan 27, 2011, 09:56 PM   #3
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That's sounds about right. Yeasterday My buddie gaped his at that on his built 2.0 fp black. Runs smooth up to 8200rpm
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Old Jan 27, 2011, 10:14 PM   #4
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.20 is what I have mine at and ER told me to put them there.
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Old Jan 28, 2011, 04:07 AM   #5
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between .20 to .24... have mine right at .22
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Old Jan 28, 2011, 07:25 AM   #6
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.20 is what i have mine at and er told me to put them there.

+20
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Old Jan 28, 2011, 07:34 AM   #7
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depends on how much boost you run....but all the suggestions so far are good. I'd stay right in the middle...the units are actually in hundredths of an inch, not tenths, so it would be 0.020 - 0.024.....unless u guys are gapping ur plugs to a quarter inch lol
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Old Jan 28, 2011, 08:19 AM   #8
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depends on how much boost you run....but all the suggestions so far are good. I'd stay right in the middle...the units are actually in hundredths of an inch, not tenths, so it would be 0.020 - 0.024.....unless u guys are gapping ur plugs to a quarter inch lol

hahah talk about working bad.
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Old Jan 28, 2011, 08:56 AM   #9
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I have a 61mm car have always gaped plugs to .026 and never had a spark issue even up to 30psi
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Old Jan 28, 2011, 10:31 AM   #10
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If I remember right mine are .022. But I'm about to change them so I'll check them for you

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Old Jan 28, 2011, 11:46 AM   #11
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where's the best place to get a tool to measure the gaps? How much should it cost?
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Old Jan 28, 2011, 12:04 PM   #12
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i would just go to your local car parts retailer. I go to O'Reilly Auto Parts. They have your regular gap guages, and some people like to try and use feeler guages.
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Old Jan 28, 2011, 12:59 PM   #13
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Feeler guages are nice and flat, don't use one of the round increasing ones " looks like a fifty cent piece" its hard to be consistent with it.
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Old Jan 29, 2011, 09:23 AM   #14
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The round ones work just fine, just don't get the parts counter cheapies at O'Reilley, they have better quality ones in the aisle.
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Old Jan 29, 2011, 10:07 AM   #15
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depends on how much boost you run....but all the suggestions so far are good. I'd stay right in the middle...the units are actually in hundredths of an inch, not tenths, so it would be 0.020 - 0.024.....unless u guys are gapping ur plugs to a quarter inch lol
I gap mine with a ruler!!..
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Old Jan 29, 2011, 10:07 AM
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