I have also added them all to the sidebar. 


How an Engine works [Part 1](http://www.youtube.com/watch?v=3WlfvRmSCXk&amp;feature=related) [(Part 2)](http://www.youtube.com/watch?v=YvT9obGIBgI&amp;feature=relmfu)

How Differential Gears work [(link)](http://www.youtube.com/watch?v=K4JhruinbWc&amp;feature=related)

How various engine parts work:

[Pistons](http://www.youtube.com/watch?v=iMwrG-vSPXs&amp;list=PLEA010B445D9AE1B3&amp;index=2&amp;feature=plpp_video)

[Piston Rings](http://www.youtube.com/watch?v=5qntk0TnyF8&amp;list=PLEA010B445D9AE1B3&amp;index=1&amp;feature=plpp_video)

[Connecting Rods](http://www.youtube.com/watch?v=cJJI9bml3gs&amp;list=PLEA010B445D9AE1B3&amp;index=4&amp;feature=plpp_video)

[Crankshaft](http://www.youtube.com/watch?v=TumqrAW2Cmc&amp;list=PLEA010B445D9AE1B3&amp;index=6&amp;feature=plpp_video)

[Engine Bearings](http://www.youtube.com/watch?v=FAmQil-D2Js&amp;list=PLEA010B445D9AE1B3&amp;index=3&amp;feature=plpp_video)

[Valves](http://www.youtube.com/watch?v=HBpQlACJM4s&amp;list=PLEA010B445D9AE1B3&amp;index=10&amp;feature=plpp_video)

[Valve Springs](http://www.youtube.com/watch?v=d3HksZvdMKg&amp;list=PLEA010B445D9AE1B3&amp;index=5&amp;feature=plpp_video)

[Valve Guides and Valve Rotation](http://www.youtube.com/watch?v=QxBlHZKU224&amp;list=PLEA010B445D9AE1B3&amp;index=7&amp;feature=plpp_video)


Several videos explaining how different parts of the powertrain works.