<... present a formula or graph that shows HP vs air temp ...>
Air density vs air temp is no trick.  HP would vary much more per application (witness Ed's dramatic increase in static RPM at low temps, which are much less dramatic with other engines).  That said, charge temperature is a really REALLY important consideration, and cooler is gooder regardless of what kind of engine you have, and if it's all that important, it should really REALLY be monitored and watched.  Otherwise, you don't really know what you're dealing with.  When Turbo Tom is talkin', ole Jim needs to be listenin', and TT says "...charge temps are EVERYTHING ... intercooling is a MUST ...".
I take him at his word.  Besides, it makes PERFECT sense .... Jim S.

Finn Lassen wrote:

Now these are real loose numbers from memory. But on a 90F day I'm not seeing much more than 10GPH climbing out through 1500'.
I seem to recall seeing 13+ GPH on a 50 or 60F day.

But surely someone here should be able to present a formula or graph that shows HP vs air temp.

Finn

Russell Duffy wrote:

(antagonizing text deleted <g>)  Of course, by fuel flow, I'm only producing 120 (hot day) to 150 (cold day) HP. You're saying you have a 30 HP difference between hot and cold days?  Holy cow !!!  Do you have intake temps to go along with that?  If not, what would be your definition of hot and cold?  I'm going to have to find those intercoolers...

Thanks for the info.Rusty

--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T