My main question is: Does engine orientation effect its performance? (example: Can I mount an OS 46FX upside down, or cocked off to the left at 7 or 10 o'clock?)

Next questions is: Is there a place I can go to learn about all the various engine types, what the 40, 46, <whatever> really mean; how engines compare, what all the various specs mean? Basicly, is there a place I can go to learn everything there is to learn about RC aircraft engines?

Thanks for your time in even reading this .

Rob