lml@lancaironline.net Mailing List Archive

In a message dated 5/19/2005 11:59:29 A.M. Central Standard Time, cberland@systems3.net writes:

Consider that cylinders that run 50d cooler - - can make more horsepower
than the cylinders running 50d hotter.
Better volumetric efficiency. George

And the measure of that would be????????? Scott

The measure is "manifold air temperature". If the manifold air temp is lowered 50 deg F, then the power would increase 5.8%. That is of course if the proper A/F is maintained. I believe there are to many variables to predict what a 50 deg cylinder temp drop would do to the manifold air temp.

Craig,

Thanks. Now I remember why I like to fly in the winter. Let's see, as we climb we lose power from reduced MAP faster than we gain in the lapse rate MAT. Saints preserve us if there is a temperature inversion.

I guess I will just have to be satisfied with the ram air boost at air speeds approaching 200 Kts.

Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)