[I hate Rice]

Alright I know what torque is and what HP is, but what I am curious is what are the determinents of it. I've been chipping away at it and does stroke or bore play more of a role in determing torque, or does it matter. I was hoping some one would just explain a little engine theory or at least point me in the right direction. I really dont want to one of those stupid 17 year olds that doesnt have an independent thought in their head. Thanks