Spark plug analysis

[BLACKCAT]

7MGTE, NGK BKR7E, total timing of 10 degrees at 15psi.

thanks

[Brendan]

Looks like they have barely been used... maybe do a few more KM's so we can give you a better indication.

From that they look fine. Maybe throw on some anti seize grease as well if your that way inclined.

[fixeruperer]

looks ok.

see the change of colour on the ground strap is nearly half way, that indicates the temp of the plug, and in the middle is perfect (closer to the thread is too hot).
it looks bit sooty, but safer than anything. whats the afr on the dyno say ? if you dont know, you should dyno it and check it out.

i cant see the porcelain. if its perfectly white all over, its safe as detonation goes.
can you see right down into the porcelain ? there should be a lil brown ring around the porcelain right at the bottom


on my bike, these are plugs from 1 power run, shut the bike off after peak rpm in 5th gear, clutched to coast.

the ring is too rich.


these are closer to spot on.


you should dyno it, instead of looking at plugs.

[BLACKCAT]

A/F was 12.5 down to 11.8 at max revs.
Gave the car a quick blast on the way home but idled a bit too much by the time I got it in the garage.

[fixeruperer]

dont ever turn your car off, like i do on my bike. (just saying haha)

yeh, you dont know how rich it is everywhere else on the map.


i warm my bike up on old plugs, put new ones in, thrash it once to 5th-6th gear, clutch coast, stop. switch plugs and ride home.

dyno man ! they are an awesome tool.

[BLACKCAT]

Looking at the ground strap in the original picture it has three different levels of colour change.

So to have close to perfect timing the first line should extend to half way of the bend?
What does the next line indicate?

[trdee]

that plug doesnt look like anything out of the ordinary for a boosted engine running rich-ish afrs

[SHEPPO3930]

Make of this what you will - Spark plug reading

[fixeruperer]

the line is the most prominent one, between the darker and lighter colour change. yours is a touch on the warmer side, but still within good range.

i check my plugs like this on my N/A stuff (bikes). with turbo stuff you need to stay on the safer richer side, which is where you are.