On Mar 4, 2005, at 10:28 PM, Sky2high@aol.com wrote:

After about 3500 MSL, WOT, 2600 rpm, start leaning to 120 ROP and continue to do this thru the climb.

Scott:

THAT is the point I was trying to make.

So far, everyone who has seen the results of that action on an instrumented engine has concluded that it's not a good idea. Seeing the data with their own eyes has been quite compelling.

Of course, you may continue to do that to your engine if you so choose. I choose not to do that, since I can think of no advantage to that action and can list several disadvantages.

I grant you that when we raced in Reno, we did things that were not good for the engine for longevity concerns, but then, we didn't need it to last more than an hour and we needed it get it all out. It is *my* OPINION, based on Reno racing and aircraft ownership experience and test stand data that racing concerns are not compatible with longevity concerns.

YMMV.

Walter