Plug cuts

[Bob Wooten]

Thanks for all the help guys.  if anyone runs into a Web site or some
pictures that show all these different things (good bad or indifferent) I
would appreciate it.

BW



-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Bruce
Sent: Friday, September 08, 2000 4:01 AM
To: diy_efi at diy-efi.org
Subject: Re: Plug cuts



From: "Bob Wooten" <r71chevy at earthlink.net>
Subject: Plug cuts
> I know that we have been down this road before, but I have a few more
> specific questions.  I went back to the NGK web site today
> (http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqread2.asp) to
take
> a look @ some of the pictures that they have there to see if I could see
> Bruce's "fly turds" (I think that was the term that he/you used), in
regards
> to what the plug looked like for detonation.  about the closest that they
> had was what they called "overheating".  Is this similar to what I would
> expect to see when I see detonation happening?

In the caption they're looking at the glossiness as an indication of the
overheating, well, since the plug is running WAY TOO hot one might expect to
see traces of detonation, and yes those specks are serious enough to
indication that it was in fact detonationg, in a serious manner.  Less
severe case will have smaller and fewer of the specks.  With a 3x or more
power magnifier they get real easy to see, and they are generally little
spheres of material.

> does anyone have a picture of the "fire ring", & a description of where it
> is (high or low) & which is an indication of what?

The Ring or band is an indication of timing.
Too advanced of timing, and the flame is over before leaving any residue on
the porclean.  Too retarded and the band is way up inside, and where the
porclean meets the housing.   Too hot of plug, and it runs too hot for much
of an ash deposit to form.

Band reading is for real hotrods then stockers.   The oems are so concerned
with 100K ish tune up intervals, they are hard to read (the bands).
Also, some brews of gas now are very clean burning.
Some of the racing fuel suppliers are mentioning specifically now that they
add additives, and what to look for.

If your plugs are showing any pink hue to them my advise is to change brands
of fuel, or change plugs real often.
Bruce

>
> thanks mucho
>
> Bob Wooten
> r71chevy at earthlink.net
> www.r71camaro.homestead.com
>
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