The YouTube video 3D Deutz engine animation is pretty neat:
This video gives us an animated look at a virtual engine, from bare block to ignition. The inline-four engine is made by Deutz, an independent German machine manufacturer. See every component: casted this, braided that, spinning this, machined that. The animated video shows the engine assembling itself, then gives you an inside look at the combustion compartment, injecting fuel, igniting it and expelling the exhaust fumes.