After you watch the whole vid ?

https://www.youtube.com/watch?v=nsa6kq-qqIE&feature=player_detailpage

Looks like it may be leaking oil a bit.

Cool video, but kind of stressful at those high rpms. I caught myself cringing and tightening my shoulders. I must have been wondering if it was gonna go BOOM!

Ya that was a little stressful, I was waiting for the BOOM. I need a drink now geez.

Thanks for helping me waste an hour of my work day. Now I am watching videos of combustion chambers and valve float. LOL

Interesting to see that the BMW MC guys manage to make the valve rotate slowly while opening 116 time per second. (14000 rpm)
http://en.wikipedia.org/wiki/BMW_S1000RR

I'm going to hug and kiss my valve springs next time I see them...

COMPRESSION is the first thing that comes to my mind - open chamber but of course this engine is spinning on a simulator like what some engine reman facility's have with a SIM test but they do not spin anything that fast. Possible a Spintron machine like what all Nascar teams use.

Valve float comes to mind

It is amazing a simple mechanical system can move fast enough to operate at those speeds.

Balanced stability .

If youtube spintron they have some valve springs in motion and at slow speeds video along with other engines spinning up. In one of their vids the valve spring bouncing all over the place very uncontrollable. Amazing to watch and how it can maintain within its functional limits and then as we all know can not maintain within all limits.

Funny how 10 to 16 k rpms just looks like everything is standing still because your eyes can not focus on things moving that fast.