In article ,
I was wondering if anyone can explain exactly how a prop governor
works for a constant speed prop system? All I know is that the engine
Oil pushes a piston in the prop hub that twists the prop to the
appropriate angle.

Go to http://www.avweb.com/news/columns/182146-1.html and take a look
at the Engine-Related Columns (scroll down some they are on the right hand
side). Esp these four:

Pelican's Perch #15: Manifold Pressure Sucks!
Pelican's Perch #16: Those Marvelous Props
Pelican's Perch #18: Mixture Magic
Pelican's Perch #19: Putting It All Together

They pretty much cover the subject of how engines, the throttle/MP, props,
and mixture work. I found them very helpful when I was a student.