Spring surge high-speed video

[Digsy]

Worth a look. The whole site is excellent, but this is worth of note for everyone who has thought of raising the stock rev limit ;)

Spring surge in action. (http://www.engr.colostate.edu/~dga/high_speed_video/#Mechanisms)

[kosmic]

wow , impressive!!

[Ian R]

Cool :)

[Ian C]

Let me see if I've got this right:

There are three bad valve conditions:
Valve float
Where the spring can't return the valve to a closed position fast enough before the cam starts opening it again

Valve bounce
The valve shuts but the spring rebounds, thus allowing the valve to bounce off the valve seat back open again

Valve somethingelse
The valve is accelerated so hard by the cam that it overpowers the spring and leaves the cam behind, thus opening far further than it really should

Fill in blanks and correct please :)

-Ian