My Pete rebuild

[Rawze]

this pic ...

http://www.dunbarchrome.com/image/jcMG

It looks just like too much injection timing for the build. - That or too much air.

I looked at the program(s) you are running (at least the ones you have sent me).. and it is running roughly in the +1 to +3 btdc SOI mappings at higher torque, very conservative, and no offset. - I do however have an early program you sent me where boost was much higher and someone added a few degrees SOI,... but it is nowhere near outside of the safe zones for that thing to say it could have caused any harm that quickly.

Makes me wonder if the compression ratio of those pistons is higher than normal. a lot of that looks just like when a 2350 gets more than about 2 or 3 degrees on it at high torque.

Maybe timing actuator going bad? -- It is more significant on the front bank than the back, but all of them seem to have the issue.

it is strange, and rare, to see that on an ISX where the injection timing, and other things are set properly, unless at some point in its past someone was trying out some wacky settings perhaps, and it happened all at once, then took its toll later on?.

Only other thing i can think of is maybe the piston temps were higher than normal and it was making for fuel condensation during mixing?

Unsure -- (Rawze scratches his head).

It looks like impingement due to too much fuel mixing time in the cylinders for the compression ratio, etc. according to that pic -- unless I am missing something.

maybe excessive cetane booster addatives?

Even so, I don't think it would have scuffed a liner like shown in your first pics. That is something else, as high carbon packing usually leaves behind vertical streaks as it flakes off and gets into the rings.

Was the engine really tight to turn by hand before tearing it down?

Just some thought.

In any event, keep one of those pistons. i would like to compare it to an OE piston and see if there is something that would change the compression ratio, etc. on it if you can. - maybe send it to me so I can have it here as future reference?