Since no one ever looks at the threads i start in tech here ya go
this is neat...check them out

http://www.youtube.com/watch?v=_REQ1...eature=related
http://www.youtube.com/watch?v=i_Npz...eature=related
inside a cylinder
http://www.youtube.com/watch?v=cy_ya...eature=related

 

nice

 

very nice, thanks for sharing.

 

wow, you would never think that all of that can happen in the time that it does.

 

its amazing what high speed camera's can allow us to see these days....i think its awsome

 

awesome!

 

really cool

 

really like the last video, puts things in perspective

 

lets you see just how much force atmospheric pressure really has once that intake valve opens.
piston moves down creating an area of less pressure and atmospheric pressure moves in to equalize it.

 

I love it, gets the gears turning in my head. Would you say that boost pressure relieves valve spring seat pressure as I've thought or does it not work like that?

 

Pressure behind the valve could only increase valve spring seat pressure as the spring is working against the valve to keep it closed.
Now if your talking about decreasing the force the valve has against the valve seat....boost behind the valve would decrease this.

 

Haha yeah sorry, valve seat pressure that's what I meant

 

thanks for sharing!!!!
i will be showing this to ALL my gear head friends

 

wow those are some really good videos

 

thanks nice video, never had no idea valve spring could bounce at high rpm. cool

 

Nice video's.

 

Yes, really insightful video's. I saw the first two a few years ago on youtube while familiarizing myself with valve float and seat pressure, after a failure I might add I have learned a lot since then, and knowing that it happens and seeing it is two totally different things. I love video's like this !! I always could picture the valves moving around and the spring bouncing during valve float but never gave thought to the motor harmonic's spinning the valve spring and valve.

While on the topic, I am going to ask this question because everyone I have asked has provided an different answer, If your cams require a 100psi seat pressure and at WOT you are running 40-45psi, on a turbo set up of course, What seat pressure should you run ?

I have come up with my own little formula but am always insightful of how people answer given you do not want to float a valve and do not want to cause excessive valve train wear.

 

I was watching a thing about sts turbo kits on ls series chevy motors and they were saying that stock valve train was fine for like 8-10lbs but anything more then that they had issues with valve float due to the boost pressure pushing the valve down. Iv never seen that issue with hondas before so I thought it was neat.

 

Very cool videos!

 

It works like that on Honda's also. Just at different points because they are made to rev higher and have better spring rate and seat pressure to deal with boost from the factory. ( Better Valve Train Stock)