Stripes on cylinder walls

[SuperRunner]

Can anybody tell me what is up with this?

I ran lean due to lost ground. I limped it home, but if I gave it really any gas, it would ping. Pistons are fine, but rings are obviously no good.

I have about 10 miles on the motor, with some idle time for tuning.

Rod bearings are in great condition.

5

 

[HellOnWheels]

Could the ring lands be broken?

HOW

 

[SuperRunner]

ring lands are fine. Forged pistons. I am wondering if the machine shop didn't bore it out enough.

 

[HellOnWheels]

Look at the plugs, may be that the lean condition melted/broke the center electrode?

HOW

 

[SuperRunner]

I definatly ran lean, no doubt about that, but not enough RPMS, or boost to break anything.

 

[TurboCustomz]

Whats is your ring gap. I know its along shot, but sometimes the bored taper causes ring end gap to decrease to a minimum at the bottom of its travel. Not to mention, when the rings heat up they expand causing the end gap to lessen. Especially on turbo cars that build a lot of heat in the combustion chambers.
HTH

Charles

 

[SuperRunner]

Wow, that is the best response I got, and guess what, you are correct.

I just figured it out about 20 minutes ago. I have no ring gap. I was supposed to file the rings, but I also thing is was the machine shop's fault. I don't think they bored it enough, because for my patictular engine, nobody has ever had to file thier rings, or at least not that I have heard.

Thanks for the response.

 

[TurboCustomz]

Originally posted by SuperRunner
Wow, that is the best response I got, and guess what, you are correct.

I just figured it out about 20 minutes ago. I have no ring gap. I was supposed to file the rings, but I also thing is was the machine shop's fault. I don't think they bored it enough, because for my patictular engine, nobody has ever had to file thier rings, or at least not that I have heard.

Thanks for the response.

At least now you know. I am always sure to check the small things like that just in case. Maybe im just perenoid but I always re-check my machine shops work. They have yet to let me down but hey. GL with getting it back together.