"Matt Barrow" wrote in message
...

"Mike Rapoport" wrote in message
ink.net...

"Matt Barrow" wrote in message
...

"Robert M. Gary" wrote in message
ups.com...
But runnnig your engine at 30" at 15,000 feet is MUCH harder on the
engine than running 30" at 5,000 feet. The engine runs hotter and
harder.

(Where are you getting this information from?)



No, it isn't. MOF, it's probably easier as the air temp is colder and
thus
aerodynamic cooling of the engine compartment will be more efficient.


Matt (TN Beech B36)
---------------------
Matthew W. Barrow
Site-Fill Homes, LLC.
Montrose, CO



The lower ambient temperatures don't compensate for the decreased mass
flow.
Temperatures rise with altitude. It is a big issue for the preasurized
piston planes flying over FL250.

So which would provide better cooling: 8000 feet and 80 degrees, or 16000
and -20?

What is the point supposed to be? It is never going to drop 100F in 8000'.

After fixing your numbers, the engine will run cooler at 8,000 and 100F than
at 16,000' 60F.

Mike
MU-2