Spark plug gap.........Need some detailed insite

**4drsleeper** · May 1st, 2001, 06:53 PM

I'm currently running a .32 gap on my plugs. I find it interested the number of different reponses you see when people ask what gap they should use. I've seen responses that vary from .28 to about .40.

So what's the deal, I've never heard an explaination as to how the gap actually effects fuel burn. How do you determine the best plug gap for optimal performance? What exactly does changing the gap do (looking for a detailed, creditable answer here)?

So, to the people who can give me a good explaination, you will all receive multiple free beers from me. You just have to come to Mobile to get them. tongue

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Go ahead, try your luck, its just a 4 door family car

**Team Hostboard** · May 1st, 2001, 07:42 PM

Beer!!!!!
http://www.ngksparkplugs.com/techinfo/spark_plugs/

Figured they explained it better smile

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...Steven
HostBoard Administrator
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**cetane** · May 1st, 2001, 07:55 PM

What if I pay for Fedex?

**4drsleeper** · May 1st, 2001, 08:17 PM

Thanks for the link, it was extremely informative to say the least!

So, here's the way I understand it:
I should reduce the gap by about .006 - .007 (.004 for every 50HP), and I should add back .002-.005 for MSD ignition.

Well, I'd say a factory gap setting would be just about right.......do you agree?

BTW, Ice cold fresh beer served every Friday and Saturday at my house. biggrin

Thanks again

**4drsleeper** · May 1st, 2001, 08:18 PM

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by cetane:
What if I pay for Fedex?<HR></BLOCKQUOTE>

Sorry, 1QuickSi wins

**Def** · May 1st, 2001, 08:24 PM

Don't forget than in a more pressurized atmosphere(i.e. Forced Induction), that the spark requires more energy to reach the electrode.

Do I'd say take your estimate that you can run the stock gap and knock .004 off the factory gap just to be safe. The little bit of power you gain from a slightly larger gap will be greatly offset if you just have a few misfires on the top end.