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To Gary Burns: The high CHT's are normal at the high FL's, contrary to what
a lot of folks might think. Even though the air temperature is quite low,
cooling is primarily a function of the flow rate AND density of the air
flowing through the cooling fins. Since the air density at FL 290 is only a
small fraction of what it is at sea level, cooling is significantly reduced.
At your speeds, the flow rate is pretty high, there just isn't as many air
molecules going thru there per unit time as there is down low at the same
(approx.) flow rate.

All high flying recips, in particular turbos that let you make lots of power
up high, suffer the same fate.

Dan Schaefer

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