"kage" wrote in message ...
Neither


Oh, come on. Cylinders suffer from age-related thermal damage
just like any other metal machinery that's subjected to heat.
Detonation can also be a factor in such cases.

Dan


"Peter R." wrote in message
...
What would be the most likely reason a cylinder in a high-time engine
would crack, old-age or poor temperature management on a descent?

--
Peter