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

 

[Indycars]

BTR is at it again with the Spintron. They push a hydraulic roller to 10,000 rpm with only a .006" bounce at valve closing. I have to wonder what brand of HR are they using. Most would fail to function properly long before the 10K mark.

 

[Grumpy]

yes, It would be very interesting to know the cam and valve train component(s) supplier,
.Im surprised they are not posting the info?
Crane used to be very well known for designing cams that carefully controlled the lifter bounce and lifter acceleration characteristics,
but I don't think they have been in business for years now.
ISKY and CROWER both have the required knowledge and test equipment access.
I doubt its comp cams, their designs tend to be designed on the ragged edge of valve train control , as they seem to be obsessed with bragging rights /peak power at the expense of durability from what Ive seen, over the decades.
obviously engineers and engineering staff and computer test equipment , dedicated test equipment like the spintron, etc,
have advanced , engineers have learned and move from company to company.