Larry Dighera wrote:
On Sat, 06 Oct 2007 11:40:55 GMT, Matt Whiting
wrote in :

I'm not aware of any real data on the subject




http://www.lycoming.textron.com/supp...ces/SSP400.pdf
Descent

Plan ahead to make a smooth temperature transition between cruise
and descent. Start descent early and allow airspeed to increase
within aircraft limits. Maintain power as required and mixture
setting. Cylinder head temperature change rate should not exceed
50 degree F per minute to avoid rapid shock cooling.


Like I said, there is no data on the subject. Lots of opinions, but no
data. The GAMI folks are some of the more data oriented out there and
they have refuted several OWTs, even some that come from the engine
manufacturers.

Maybe you can point how to me the test data in an of the references you
posted that shows multiple identical engines, some that were run only at
steady RPM and some that were used for touch and goes all day, and the
component measurements at tear-down. I didn't see this in anything you
posted.


Matt