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Flatwrench

Hello, First thank you for the invite to the forums. I appreciate being able to post and ask questions.

I have x15 efficiency series cm2350 with 500hp and 1650ftlbs file flashed stock.

Mountain hauling and i25 at 75mph. Daily to denver and back home over the mountains. 9% grade. Engine made it to 10k hours 570k miles before taking number 6# ring....It was with optional range with no overheating logging but was towards higher end. I blame myself for not making it out fleet rotation and cleaning fins of the radiator. Maybe we could have prevented it.

All liners look like this except for number 6 with scoring.

We run more 450st and they are tanks....like 23k hrs and 600k miles with no blowby or very minor.....Champs. Almost 1mpg better fuel mileage on same run. Even the 565hp at 600k are holding well on no byblow.

Efficiency 500hp doesn't seem to be great match at this elevation from 10,000 to 5,000.

Question: Is it possible to turn the 4342 cpl down to 475 or 450? What are your guys thought on the liners?

It was a new driver to us that drove this truck for last year. It was full throttle or nothing.

Appreciate any thoughts. Engine has been rebuilt with Guideline on the forums with new radiator also. Just want to keep this purring best at possible like rest of the isx's in the fleet.

Thank you .