Couple of clips I came across on you toob ...

Engine 3D animation:
http://www.youtube.com/watch?v=60QX5RY_ohQ

Inside a firing cylinder:
http://www.youtube.com/watch?v=cy_yaAOKjA8

Vavle spring at 7000rpm:
http://www.youtube.com/watch?v=i_NpzU4pGjc

Valve float:
http://www.youtube.com/watch?v=_REQ1PUM0rY