spark plug damage help!

[steve963]

do you say too rich, cause of the black on the rest of the plug, and too hot a heat range because of the slight what appears to be melting?

defo runs too rich, got an AEM wideband and it runs down to 10AFR

put the NGK 8`s in earlier and seems to run nice, engine noise even seemed a little less harse, but only had very short run, so will see again tomorrow

 

[steve963]

had a bit of a longer drive this morning, the engine definatly seems to make a better noise, slightly less harse sounding

I must have been getting DET before, hope I havent damaged it too much

sure I saw a circular mark on the top of the piston, but was probably the light from the torch in the shape of the spark plug hole

 

[pulsarboby]

no thats on the top of every standard piston nothing to do with the plugs

 

[youngsyp]

The colour of the plug earth electrode looks fine (from what I can see) but, that gap looks huge too.
The insulator colour looks a little odd too ?!
And that earth electrode looks bent as well as worn ?!

Paul

 

[Fusion Ed]

If you were experiencing det, enough to melt a part on your plugs, then chances are you have also caused other damage, and since your running rich its almost certainly to do with ignition timing...

 

[steve963]

almost certainly to do with ignition timing...

not because the plug was too hot and igniting the mix before it sparked?

 

[Fusion Ed]

Well yes its possible, but in most cases its usually timing causes a problem first before plugs do.

 

[steve963]

thanks guys,

guess ill have a look at the new plugs for wear and do a compression while im there

(the open my wallet for a RR session)