I found this on streetfire and found it amazing. This is the kind of thing I want to be doing for a living - making computer models of engines, and then putting those models to work.
Streetfire
For those of you who ever needed a visualization to understand how an engine works, this is a great vid. This is a CAD animation of the assembly and operation of a four cylinder fuel injected Ford engine with a single overhead cam. It goes over the basic rotation of the engine first, and then shows you the combustion process. Then it moves onto the way the intake air and exhaust air play a role in the process. After that, it shows the way the cooling process works, followed by the oiling/lubricating system, and also the cam, rocker, valve and valvespring operation. Finally it shows all of the systems working together.