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Try this.
The horsepower is pretty much a function of the quantity of air that is
being pumped through the engine. This volume of air roughly is a function
of the manifold pressure and the RPM's. If your engine produces full power
at 2700 RPM and 29.92" manifold pressure, then the % power can be estimated
by:
% power = ((MP/29.92) * (RPM/2700)) * 100
For example say your engine produces 200 HP at 2700 RPM and 29.92" MP. If
you're running along at 24" MP and 2400 RPM then you should be putting out
Approx. 143 HP or 71% power. (24/29.92)*(2400/2700)*100
This approximation works on the rich side of peak only. On the lean side,
the power output is basically a function of the fuel flow.
I've attached a spreadsheet that I use for the TSIO 550E. You can change
the full power manifold pressure and RPM's to fit your needs. Disregard the
LOP numbers unless you have this same engine. The specific fuel consumption
is different for each engine.
Hal Woodruff
IV-P at 100 hours and going strong
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