ORIGINAL: Tired Old Man
I work with some pedigreed program managers that can't put that together. They make a call for more power so you give it to them. Then they complain it runs hotter than the last one....... It gets better. After getting more power they complain they don't have flight duration as long as they did before. You can't win.
........Heat damage is accumulative. A few minutes here, a few minutes there....
Fuel chemical energy + Air => Combustion inside engine => Heat energy
Heat energy => Mechanical energy (applied to prop) + Heat energy (wasted to atmosphere)
More burnt fuel / time => More heat energy / time (Achievable with higher displacement (heavier engine) and/or higher rpm's)
Higher compression ratio => More heat energy / time (Premature explosion is the limit)
More Heat energy used as Mechanical energy (applied to prop) => Less Heat energy (wasted to atmosphere) (Limit is the lubrication and metals)