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Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Mike Wylde » 4 years ago
I'm not familiar with this plug's design, but if you mean the spark gap is between two curved surfaces, as in many traditional aviation plugs, you should use a wire feeler gauge not a flat blade feeler gauge. Does that make sense?
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Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Craig E Maiman » 4 years ago
That totally makes sense to me. I've been trying to find a good metric wire feeler gauge, but not having much luck. I suppose I could use an English one. The ones I've seen have a value of .632mm and that's between the .6 and .7mm that it's supposed to be for that plug.
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Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Mike Wylde » 4 years ago
The traditional 25 thou'. What could be better?
Thank you said by: Craig E Maiman
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Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Bill Hertzel » 4 years ago
Like Mike said!
0.6-0.7mm is 0.024 - 0.028" ... 25 thou fills the gap!The U-Shaped Electrode is a Denso Invention.
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It is interesting to note on the Denso Web Site... " (Denso) spark plugs are not for use in any aircraft engines... ".
Just like the NGK are also not!Stay tuned for future announcements! ?
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
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Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Craig E Maiman » 4 years ago
That's what happens when lawyers get involved....
The box actually has a symbol of an airplane with the classic red circle with the slash across it...
With the shape of that "U-Groove" it seems that a flat gauge is perfectly fine. "25 Thou" it is! ?
