Very interesting counter-point. What do you mean by ''dimension affected velocities'' ?
Even though I am graduating Mech Eng this year, the more I read, the more I realise I really don't know much...
Just a couple of examples that you will instantly be able to extrapolate from.
The longer the stroke, for any given RPM, the faster the piston speed.
Connecting rod big end velocity profiles, same thing.
The larger the journal size, for any given RPM the higher the peripheral velocity at the bearing surface.
The larger the rolling element bearing is, for any given RPM the higher the outer race peripheral velocity is, ditto the inner, ditto the ball circular velocity and ball rolling velocity.
The longer the stroke is, the greater the moment arm is of the throw.
My guess is that your Mech Eng'g studies include very little on engines, while being packed full of Mech Eng'g at large.
But your schooling should make it a cinch to quickly pick up engine design concepts and principles real fast.