valve float
 

a little off topic but cool nonetheless. The fun starts about halfway through. :)

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I always thought if you threw them in water, that was how you could tell...

Holy crap - how many FPS does a camera need to capture movement!

Interesting video, but why do you think the valves are floating? I can't tell from this video.

-Andy

They are on the verge of float because the springs are turning so they are just able to rebound and close the valve in time. They do not have enough reserve pressure to keep themselves fixed in place.

I just wanted a title and that seemed easier than "BMW engine valvetrain revving crazy fast" :rolleyes:

so when do 911 motors start spinning springs? interesting video

Here's another good video of float, spin,spring surge and valve bounce

YouTube - Valve Float