Yo,


Here are my plugs after 7,000 miles:




It is Leading - Trailing - Leading - Trailing.

I thought I would throw this up for giggles.

How do they look?

Kevin
1989 GTUs "And don't scare me..."

 

It's hard to see just how worn the electrodes are.

You have much less carbon buildup than I do after a mere 5000 Kms.

 

yea, a lot cleaner than mine were when I took em out.

 

wow, mine were filthey after 5k miles.

 

Can you give us some engine stats, Kevin?

Mods, Oil brand, MOP (y/n), Fuel octane, Plug numbers (some guys use 9's all around instead of stock 7s and 9s), etc etc.

 

Yo,


No problem bro:

Mods:

NA 13B
Cone intake
Wired 6 ports
RB DP/HKS exhaust Now...
RB street header/Mazdatrix True Dual

Oil Brand:

Havoline 20/50

MOP:

Yes, but I have been adding 1 ounce of premix for every 2 gallons at fillup.

Fuel Octane:

87 (Lower if I can find it. *grin*)

Plug Numbers:

Stock, 9's and 7's.

Sorry about the pic, it was a quickie.

Kevin
1989 GTUs "The car pulls way harder now..."

 

They look great to me, perhaps a *hair* lean, but on an NA that isnt a real big deal anyway. But in general, that is exactly what you want. Guys with turbo cars cannot expect theirs to look like that, theyll always be darker due to needing to run richer.

 

yea, i figured that judging by the pic it lookiks like you are running perfect. like kevin said maybe a little lean, but a hell of a lot cleaner than anyone else's i've seen.

 

Light gray deposits are textbook perfect for NA piston engines and I hear that NA rotaries run best toward 14.7:1 af. anyhow. Running some premix mught help as some types of two stroke oil have detergents in them to clean off engine deposits. But wired sixth ports? Why o why, Kevin? A true GTUs deserves all the low end torque it can get, my brotha.

 

Yo,

I hear you my brotha. Dana and I are working on it, I just bought a whole buttload of Hose Techniques silicon hose...we're going to replace all the vacuum lines when we put on the ported manifolds.

I'm also going to throw in the Pineapple sleeves at the same time...I need to get on it for SevenStock 6.

It's getting close!

Kevin
1989 GTUs "Torqueless wonder..."

 

when I changed my plugs 2 months ago they were a darker brown and it was uneven. One side would be lighter/darker than the other side. What does this mean?

 

I've had a few come out quite black after not too many miles. I assume this is from running rich.

What's the deal when they are orange? Heat I assume.

I've had that happen once. I pulled out the plugs and there was the normal black colour, but had hints of orange. What do you think?

 

Looks like they could use some boost

 

BTW Kevin (landers)

Could the 'hair' lean on Rarest's plugs be due to wired open aux. ports?

I would imagine so, but your the expert..

 

port and match the intake manifold while you're at it!!!

i sure would if i was going to have mine all apart.

 

Yo,


That's the plan!

Kevin
1989 GTUs "Not to mention the powdercoat..."

 

they look fine. My come out a lot darker because i run rich. Looks like you are running just a tab bit lean... othersie they look good.

 

Yo,


Cool man, thanks for all the advice!

This place rocks!

Kevin
1989 GTUs "Lean and Mean!"

 

by reading those. I can tell...














you need a turbo!!

 

I concur.

 

I got your turbo right here.

Ahh who am I kidding. I'm going to be working on my turbo 13B project by summer '04, so..

NOT in my GXL btw..

 

No, but the full exhaust and intake are where most of his gains come from. Considering s5's rev out to 8500+, it is possible to run a bit lean with these mods on top end but still pull out great.

I wouldnt say that, just someone with experience.

 

hmmm... here is mine after 12k miles. it was time for a change!

I'm interested in why one is so worn compared to the others.

all plugs were "trailings". crane box on the leadings.




I've gone back to leadings / trailings now.

 

Those almost look like mine when I pull them out. Mine are usually a little more evenly colored though, without the spottiness on the leads but I pull mine after 6k usually. I was wondering the reason my rear leads wear faster than the fronts too, like Scott 89t2 ?