Reading Spark Plugs

[Tom Kirkham]

Here is an interesting video on reading spark plugs.

http://www.youtube.com/watch?v=fiMM2S0aADM

A lot of the same info only written out

http://www.dragstuff.com/techarticle...ead-plugs.html

[iva bigan]

Tom
Here is one of the dangers of running too rich.
http://www.youtube.com/watch?v=5MlkR2FXPvQ&NR=1

Iva bigan

[priobe]

Tom,
Great video.

But I have heard with all the additives and 10% ethanol that these reading are not obtainable?

Have you heard any different?

[bobcowan]

Originally Posted by priobe

Tom,
Great video.

But I have heard with all the additives and 10% ethanol that these reading are not obtainable?

Have you heard any different?

That's pretty much true. With modern fuels, alcohol, additives, etc, reading the plugs is not as accurate as it used to be. Signs if significant detonation, or significantly rich/lean are there. But for fine tuning it just doesn't work. Unless you're using leaded race fuel.