Here is an interesting high speed video showing what happens when a valve spring is run over its design limit.This isnt a Porsche ,but is representative of a spring that cant cope with high RPM's. Makes you want to think twice about high RPM's on stock springs....Kevin

http://media.putfile.com/valve-float

 

thanks Kevin good find and interesting!!!! Guess that would be a type II overrev

 

LOL....yes it is. We just received our custom valve springs and I was interested in seeing the issues with lesser springs. It isnt pretty! Kevin

 

How many times will a valve open and close at very high RPM? Say in one second, how often? Since that video is slow motion, I wonder how fast those are really moving.

 

Well, we are hoping to run close to 8500 rpms so that would be 8500/60sec= 171 revolutions per sec. The intake will open every second crank turn so 171/2= 85.5 valve actions per sec at 8500rpm's...I think that is correct ...Kinda scary when you think about it. Kevin

 

Kevin,

Thinking about it, I think the intake will open every 4th stroke, no?

 

I think you are right....thats why I used to protect myself..lol.... Still scary though. Kevin

 

If you look at the time the video isnt much longer then a second or two in real time. They slow it down so that it takes a minuet and 15 seconds

 

Kevin,

So you guys finally got these in your hot little hands?