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Spark gap, .50 or .45?

 
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Old 18 Oct 2004, 12:27 pm
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Default Spark gap, .50 or .45?

A few months ago, several folks suggested reducing the gap from .50 to.45 for less hesitation and smoother acceleration. I tried it and took a hit on MPG. If you changed also, let me know if your MPG changed and if you actually noticed an improvement in performance. I am using the double platinum plugs.
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Old 18 Oct 2004, 01:36 pm
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I did mine over a year ago (Champion platinums) and set them at 0.050.
My mileage has consitently crept upward to about 25+ now at nearly 80,000 miles.
I find it hard to fathom that the plug gap could have much impact on mileage. What I have read is that when folks check the gap of plugs they take out (I didn't) the gap has grown.
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Old 18 Oct 2004, 01:52 pm
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Quote:
quote:Originally posted by clevelandmike

A few months ago, several folks suggested reducing the gap from .50 to.45 for less hesitation and smoother acceleration. I tried it and took a hit on MPG. If you changed also, let me know if your MPG changed and if you actually noticed an improvement in performance. I am using the double platinum plugs.
On a turbo you can get a "blow out" effect @ high boost / high RPM. Closing the gap can reduce this problem. I run a .42-.45 on my turbo. It has helped some. On a NA car I don't believe it is necessary.
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Old 18 Oct 2004, 02:36 pm
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I agree with Cal. All of the talk I've heard about dropping the plug gap has been with the Turbo only.
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Old 18 Oct 2004, 09:27 pm
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Let me see if I got this right 50 on the NA's
and 45 on the turbos?
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Old 19 Oct 2004, 02:23 pm
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Based on my interpretations of the recommendations of the good folks on this Forum, I set our NA car's plug gap at .042"
I did this because the original plugs (at 60K miles) were at a giant .085" (!) when I took them out...and figured I could get better "area under the curve" sweet spot time by initially setting the Double Platinums to the low side of the scale.

10K miles later.....so far so good [?]
Brian
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Old 19 Oct 2004, 04:08 pm
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I guess I could say I did notice a slight change in gas mileage. I did record to runs of 21, then installed my DBL plats and 8.5mm wires, changing the gas from .5 to .45 and now record 19 MPG. I have notice a slight better performance change however.
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