ORIGINAL: gkamysz
Turbochargers operate in a different realm when discussing RPM. One advantage for high speed is ceramic balls are much lighter than steel. This results in much less centrifugal forces on the balls and increased RPM limits. I've been researching machine tool spindle bearings and the there is an advantage in high RPM applications to ceramic hybrid bearings. An engine is a low RPM (relative to bearing size) application. Bearing suppliers say that ceramics are not applicable to high loads and low speed. All of this information is available in engineering guides of bearing suppliers.
To the OP what base or reference engine is being described? Porting an engine to get the desired output is tricky.
The engine I had in mind is my TT .46 Pro. I know there is power to be had from changing port timing. I've seen dyno proof on r/c car engines. Since aircraft engines are run in a different fashion, I didnt know if there would be as big a difference in power or not. Originally, all I wanted to know is if one opened the boost port 10° sooner, what would happen; or if you opened the boost port 10° and opened the exhaust port 5° what would be the outcome...? These are just examples.