Spark Plug Reading was: WPSLPGExhaust Gas Oxygen (EGO) sensor Information

[Bruce Plecan]

> Grumpy,
> Thanks for the info, every bit helps.  I agree with you in that adjusting
> one variable can easily affect a different parameter than what one expects
> it to.
> I find setting WOT mixture the easiest of all.   I do a high speed plug
> chop,  chuck the plugs in the lathe and cut off the outer shell.  You can
> then see exactly where the soot ring is on the porcelain.  No guessing
> involved at all.

Few people have access to being able to do.

> The detonation thing I find a lot more difficult.  As you say it is an art
> which you learn with experience.  After a three thousand mile trip to the
> Rockies I noticed ( with an 8X magnifier) that my plugs had shiny metal
> balls on one side of the side electrode.

This is where indexing helps.
The plug usually is uniform.

The center electrode was
> considerably rounded on the edges.

3K that would be normal wear, mostly.
Lots of plugs "start" to lose the corners in a K miles.

  The center electrode had fuel salts on
> it up to about 1/2 mm from the tip ( about the start of the electrode
> rounding).  The porcelain had a generally light brown tint with little
> brown specks or balls on it.  This was done with "normal" ignition advance
> and mixture and 87 octane gas.

Describe what your calling fuel salts.  Not sure of what your addressing
Brown balls?.

You might have a bit of "tip in ping"
Grumpy
>
> This weekend if I have some time I plan to do  some plug chops to check it
> out some more.
>
> Neil
>
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