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Old 11-08-2017, 12:43 PM   #11
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If a plugs hangs inside the combustion chamber its going to glow red hot and cause detonation , It will also mess with the timing altho slightly the 2 togather would cause issues
I wouldnt do it for the small gain it MIGHT get

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Old 11-09-2017, 07:30 PM   #12
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when i ran thunderbird super coupes i liked a range colder shorter plugs always ran better. if i could find colder motorcraft plugs for my focus i would be glad to try them . i also seemed to notice a good increase in gas mileage when i opened up the spark plug gap from 36 to 52 the last two tanks of gas i averaged 47 and 42

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Old 11-10-2017, 02:09 PM   #13
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I have to install plugs here pretty soon. I ordered the Motorcraft SP535’s and read they’re gapped at .037 Is that correct?
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Old 11-10-2017, 02:14 PM   #14
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Correct, Ford recommends .035 (close enough) or .9mm
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Old 11-10-2017, 09:28 PM   #15
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2 liter 4 each cylinder swept volume 500cc.
12 to one compression 1/12 of 500 cc is 41cc

Naturally this a poor way to guess at the TDC piston area in the chamber..
SO you can say the most you could jam in there is about 1CC of spark plug before you F*K you engine good and proper..

1cc of 41cc is 2.5% increase in compression ratio. And I bet the most possible space used is more like 0.5cc of volume..
So a ONE PERCENT increase in ratio

So instead of 12:1 you will have 12.01 :1

When the very first time you crank you hole a piston.
When the very first time you crank a valve jams and bends hitting the spark plug

And if those problems do not happen.
Then when you hole a piston due to the white hot plugs blowing up you cylinders during a fast high RPM drive.
and finally if all those bad things do not happen.. when you cannot get that carboned up burnt up dead spark plug out ever again..'Cuz you left it in there for a year... and have to take the head off

Added: the small engine power increase from ignition advance (due to the plug being more centered in combustion chamber of a fixed advance in a small motor) will be negated by the automatic spark plug advance/retard of a modern engine using the knock sensor...
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Old 11-11-2017, 12:46 PM   #16
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I pulled these out today at 72k miles and replaced with the previously mentioned motorcraft plugs. Let me know if anything looks suspect.

Oddly enough, I found a piece of black plastic or rubber on the last plug (driver side):
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Old 11-12-2017, 03:20 PM   #17
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I don't know if it's the angle or if it's the camera. But that second plug from the top looks darker than the others.

I replaced my plugs @ 103K and they looked good. Didn't even check the Spark Plug Gap on the SP535's, just placed them right in.
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