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Old 03-24-2005, 10:16 PM   #1 (permalink)
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Default spark plug gap too small?

So i changed my spark plugs on the vr4 the other day, i had some old crappy plugs in the rear and some relatively new denso iridiums ik20's in the front. i replaced all 6 plugs with denso iridium ik24's and replaced the wires with ngk wires. The new iridiums said they were gapped at .032, but when i tested them with my gap gauge i found they were gapped more around .027 or so. i went ahead and put them in ayway, thinkin maybe my gap gauge was off since it was kinda old and rusty. Well the car now runs smoother than before, but doesn't feel as powerful, it feels like i start to lose power around 3500-4k rpm's. Would having too small of a plug gap cause this problem?
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Old 03-24-2005, 10:21 PM   #2 (permalink)
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Default Re: spark plug gap too small?

ummmm yea its too small.
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Old 03-24-2005, 11:37 PM   #3 (permalink)
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Default Re: spark plug gap too small?

I have actually been told to make my gap smaller so it can handle higher boost. I have mine at .034 and I am told they should be around .028, so you should be fine.
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Old 03-25-2005, 12:09 AM   #4 (permalink)
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Default Re: spark plug gap too small?

Quote:
Originally Posted by 3000SL95
So i changed my spark plugs on the vr4 the other day, i had some old crappy plugs in the rear and some relatively new denso iridiums ik20's in the front. i replaced all 6 plugs with denso iridium ik24's and replaced the wires with ngk wires. The new iridiums said they were gapped at .032, but when i tested them with my gap gauge i found they were gapped more around .027 or so. i went ahead and put them in ayway, thinkin maybe my gap gauge was off since it was kinda old and rusty. Well the car now runs smoother than before, but doesn't feel as powerful, it feels like i start to lose power around 3500-4k rpm's. Would having too small of a plug gap cause this problem?
actually too small of a gap can lead to power loss. Your arc may not be wide enough. In otherwords you probably arent igniting the entire fuel mixture up top. NEVER EVER TRUST THE GAP OUT OF THE BOX. They are almost always wrong. Use your feeler guage or gapper. You just need to find the medium that works for you. Try around 32 and see what happens.

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Old 03-25-2005, 07:21 AM   #5 (permalink)
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Default Re: spark plug gap too small?

I'm gapped at .022 on NGK coppers... the car is far from slow
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Old 03-25-2005, 08:10 AM   #6 (permalink)
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Default Re: spark plug gap too small?

0.027-0.028 isn't too tight for a street car. Personally I would do some work to impove the ignition system if I had to go any tighter than that though.
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Old 03-25-2005, 08:13 AM   #7 (permalink)
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Default Re: spark plug gap too small?

i gap at 28 and even with nos i get no blow out ,,,but i do have the hks dli
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Old 03-25-2005, 09:11 AM   #8 (permalink)
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Default Re: spark plug gap too small?

explain to me the benefit of a .030 gap over a .022 gap? I mean really... is that going to get you any more horsepower or a more complete burn? 8 thousandths?
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Old 03-25-2005, 09:39 AM   #9 (permalink)
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Default Re: spark plug gap too small?

Quote:
Originally Posted by Mellon
explain to me the benefit of a .030 gap over a .022 gap? I mean really... is that going to get you any more horsepower or a more complete burn? 8 thousandths?
A larger gap will allow a more complete burn and therefore less emissions under low load conditions (idle and cruise). You can also run a leaner mixture in those areas without running into a misfire condition.

Of course once the load goes up and cylinder pressures increase it doesn't take much of a spark to get the burn going and things are so tight molecularly that the burn is more apt to complete without missing any fuel.
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Old 03-25-2005, 10:10 AM   #10 (permalink)
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Default Re: spark plug gap too small?

Quote:
Originally Posted by Mellon
I'm gapped at .022 on NGK coppers... the car is far from slow

yea it is far from slow chris ,,,its verrrrrrry sloooooooowwwwww
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