Spintron - Not another valve spring video !

[Indycars]

This video by Brian Tooley talks about his Spintron and the trace of the valve lift. The important terms he deals with are
Opening Deflection, Loft, Closing Deflection, and Closing Bounce.

Below is an example of such a trace ......

 

[Grumpy]

WOW, that's certainly an impressive example of a badly designed or assembled valve train,
non-matched springs or bad cam lobe design, anytime the lifter looses contact with the cam lobe ,power and durability is rapidly compromised