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Mind you...I feel like this is user error...I installed all new pistons/rings like 5k-ish miles ago. I noticed degraded performance and smoking on deceleration, so I decided to pull the plugs, and found this:
So looks like cylinder #7 is the winner. I did a compression test...almost 0 psi in that cylinder. Pulled the head, then the piston...found this:
How in the world did that top ring overlap itself like that? Also...how did this not completely tear up my cylinder because it's as clean as a whistle?? Waiting for a new piston on order...I'm not a patient person. HAHA
I couldn't tell you off the top of my head, but I did do a bunch of research prior to doing all of this and had all the appropriate OEM numbers. It's quite possible I screwed up a measurement on this set of rings though.
5K miles and the piston has that much build up on it??? Are you consuming oil???
Yes - it was consuming quite a bit of oil before I decided to rip in to it. I couldn't tell if it was coming from the leak I had, but when I fixed it and it started eating more oil...I figured it was time to go deeper.
How does the cylinder wall look???
Was this a standard bore or bored over size???
How do the combustion chambers look on the heads???
How does that rod bearing look???
How does the cylinder wall look???
Was this a standard bore or bored over size???
How do the combustion chambers look on the heads???
How does that rod bearing look???
Cylinder wall is smooth - no grooves/etc. Standard bore. Combustion chamber on the head is dirty from the oil burning, but otherwise looks good. Rod bearing looks immaculate - I did all the bearings when I put the new pistons/rings in. I'm generally a "lucky" person...at least that's what I've been told...so I'm just going to go with that and use this as a learning experience.
Also keep in mind that the missing parts of that piston are in the engine somewhere. Even if you’ve located the big pieces, there’s likely smalls somewhere.
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How does a ring overlap itself? 
