"Valve spring and seat in slow motion.. Quite interesting.
http://www.youtube.com/watch?v=_REQ1PUM0rY
And one showing the combustion pattern:
http://www.youtube.com/watch?v=sEf8va1S7Sw
lastly a subaru (i think ?) complete engine rocking in the engine bay.. you can sort of see how it rocks accordingly to the balance:
http://www.youtube.com/watch?v=wUESef9Z7pE
"
Carsten
