Captain N
Unfortunately Money is the big factor here. Sikorsky and Eurocopter ask for an engine that makes XYZ power at XYZ temps and that is wht the engine guys have to provide. If this turns out to be not enough for some instances then so be it. It would be up to the airframer to certify a new engine in their aircraft just to meet the needs of the few operators who work in high temp areas. If they were to do so then it would make sense to put the same high output engines in all the airframes. This is very much what was mentioned earlier in this thread about the Ardiden engine which will be much more powerful than the current Arriel. Not to mention all this hot rodding we talk about in making more power from an engine has consequences too. More power means more stress on a gearbox and airframe which takes modification as well. It is very much like building a race car...bigger engine means stronger transmission and driveline then a rollcage for stiffness and so on....do you see the snowball getting bigger? As much as I hate to say it if you want a bigger snowball you better have a bigger pocket book.
MaxTork