Critique My Plugs.

[dontfeelcold]

Curious to know what people think of my plugs. They don't look as good as the set they replaced 15000km ago. The last set had a nice even colouring. I think I might be getting or at some point have had some inaudible detonation.

The plugs have come out slightly creamier in pics than in real life. Where you can see the ceramic it's actually alot whiter.

The plugs 1, 2, 4 and 6 have a white streak about 3mm wide down the side of the nose insulator, the plugs 2, 5 and 6 have a green tinge on the electrode.

Plugs are unmodified BCPR6ES-11

Edited July 16, 2014 by dontfeelcold

[Sinista32]

They are perfectly normal

edit. will add look old so need replacing but to me they look good.

perhaps 2, 5, 6 may have some minor lead (coil) issue but would like to know the age of the plugs first.

Personally I would not be overly worried.

Edited July 16, 2014 by Sinista32

[dontfeelcold]

Plugs are 15000km old. Pulled them out and replaced them yesterday.

[dontfeelcold]

It's the green tinge and the white clean) line going down the insulator that looks odd to me.

[dontfeelcold]

Plug 2 shows the line well and 5 and 6 show the green tinge.

Edited July 16, 2014 by dontfeelcold

[scotty nm35]

Looks like the perfect heat range too. Just slap a new set in and change them at another 15 thou. For the price I would probably do them every 10.

[sucram]

colour of the ceramic has little to do with det and more to do with overall mixture. Unless you hot shut down your car after a dyno pull or track run, every cycle will change it there after.

If you want to look at det you need to look at the strap under magnification

Not sure about the green, but the green ones are slightly leaner so you can either try richening those cylinders up of leaning off the other ones. sand blast or soak in upper engine cleaner and put them back in if you don't want to do that to your new plugs

[dontfeelcold]

What should I be looking at on the strap of the plug that shows signs of detonation? pitting?

[sucram]

It would be hard to pit the strap without blowing an engine. Best thing is to get it under good magnification and tell me what you see.