Spark Plug Gap Question

[speedygeorge]

I was installing new Bosch Super Plus, I understand that gap is supposed to be 0.028, the box says they are 0.28 but when I checked with my gap wheel they said they came out of the box at about 0.24, the old plug I pulled out were 0.35, am I missing something here I assuming my little gap tool is accurate, how much difference does it make if I am off 0.005

[Wildthings]

.024" is probably okay, but I would go ahead and regap them a little closer to spec if they were mine. You might get yourself a wire gauge to check your wheel against. The wire is going to be more accurate.

[morymob]

Each vehicle will respond some to different plug gaps. My last driver of 14 yrs a '84 GL was sensitive to the point where ran it's best at .40 gap, set at fact gap and got a good 1 1/2 mpg less, i proved when making lots 700 mi trips to south of Nashville. I am now testing plugs that fit a Mazda rotary engine and with a new broken in engine 25-26 not too shabby.

[MarkWard]

I'm not advocating changing the gap, but assuming the ignition system can support a larger plug gap, you are actually exposing a larger flame front to the mixture which could account for a change in performance. When we ran the MSD ignition on the race cars, we would run as much as .060".
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[vanjoe]

Does the spark plug gap make the vehicle run richer or leaner?

[Wildthings]