Just for easy reference, I have an app on my phone called the IO-360 Power Calculator (available for both iOS and Android) for the 200 HP angle valve engines.
You just set the percent power desired, altitude and OAT and you get manifold pressure and the associated fuel flow. There are options for both best power and best economy. It is dirt simple and fast to use, although your particular installation might be a bit off the numbers depending on intake, compression ratio, etc.
Example output- @1500' and 54?F, max power available is 90% at 2700 RPM and 14.5 gph (or 2600 @14.4 gph). In order to get 95% at 1500', you have to be below 52?F, where you can get it 2700 RPM and 15.1 GPH.
I find this to be a good guideline for operations.
Andy Elliott, CFI, RV-8, N303RV
Flight Reviews, Dynamic Prop Balancing
KFFZ, Mesa, AZ
2020 Dues Paid