Spark plug gap

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Spark plug gap

Postby TulsaSpider on Fri Jul 24, 2009 5:50 pm

Ok for some reason the simplest thing I can't find. I just changed my ignition over from the point system to the Fiat electronic ignition from my 79 parts car. I searched on here and didn't find, I called my local parts store and they said .30 and I know that's not right. There wasn't any noticeable improvements in acceleration when I took it for a test drive, but I didn't change the plug gaps. Thanks
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Re: Spark plug gap

Postby pope on Fri Jul 24, 2009 6:02 pm

.027 — .031 in inches
.7 — .8 mm
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Re: Spark plug gap

Postby TulsaSpider on Fri Jul 24, 2009 8:38 pm

Ok well I had the plugs gapped at .35 with the point setup, shouldn't the gap increase with an electronic ignition????
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Re: Spark plug gap

Postby racydave on Fri Jul 24, 2009 8:41 pm

I re-gaped my NGKs from 35 to 30. I think I liked 35 better.
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Re: Spark plug gap

Postby TulsaSpider on Sat Jul 25, 2009 12:17 pm

Anyone else care to weigh in on this???
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Re: Spark plug gap

Postby kmead on Sat Jul 25, 2009 2:03 pm

A spark is a spark. I wouldn't expect any performance boost, particularly with the stock set up. Now if you were going with a crank sensor system tied in with the injection system you could get some performance change.

What you are gaining is less maintenance and improved consistency of that spark with the stock electronic ignition system.

Go with the gap that is suggested for a 1979 or later car that had the electronic ignition. There may be a plate in your parts car's engine compartment with the correct data printed on it.
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Re: Spark plug gap

Postby racydave on Sun Jul 26, 2009 5:37 am

From my 79 owners manual. .023 to ,.027 for std plug. .027 to .031 for resistors. NGK listed .025. For good performance, total advance at approx 3,000 rpms should give you approx 36 degrees total advance. You may need to set the static timing to 16 to 18 btdc as long as it starts easy on warm engine.
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Re: Spark plug gap

Postby pope on Sun Jul 26, 2009 9:06 am

This isnt tough stuff!
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Re: Spark plug gap

Postby mdrburchette on Tue Jul 28, 2009 9:32 pm

One thing you may want to do is check the gap at the pickup also. As far as setting the gap on the plugs, I opened mine up to around 35. Timing was bumped up, like Dave says, to get the total advance up there a bit. I believe I'm running around 14 degrees static.
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