^^^^ I was going to say the same thing. It would be kind of cool if they had a tach on the screen so you could see at what rpm you can no longer see the springs being compressed. My other thought was when is this thing going to go BOOM!!

Buzz saw is all i can say. It's amazing to see i kept expecting that cam to just tear those tips to shread's...or buzz them to shread's


https://www.youtube.com/watch?v=_REQ1PUM0rY&feature=player_detailpage Slow it done a bit not so radical...there's old people here ya know.

So, how do I get my daughter's go kart to rev to 14,000 rpm? It has an overhead valve engine so just a quick cam and spring change?

Exactly one of my first thoughts. As it came to the top rpm, it literally reminded me of cutting some roll cage tubing with a big chop saw.

Quickly followed by what the heck kind oil can keep this schit together ! LOL.

Obviously another one of my thoughts was - oh my fking valvesprings !!!!!!

Another - how the hell is air and fuel supposed to get in there that fast ?

Many, many more of course.

Amazing stuff ! Just wanted to share an OMG !!!!

Amazing, amazing....

i never knew the valve spring rotated like that.

Yamaha R6 revs to 16,200 ( tach says 17,500) Its amazing and the engines last a long time. I have a customer who regularly runs it to redline with 20k+ plus miles on the clock.

you need to watch more youtube video.

There was a Honda bike that you could watch spin up to around 17 K on youtube a couple of years ago. Looked like nothing moving just sitting still because it was spinning so fast.

And.....valvetrain runs half speed of crank/rod/pistons. Thus why discussion of piston speed comes up here and there.

Amazing stuff for sure.

And here is the sounds of a Renault V10 at a mesmarizing (sp?) 20,000 rpm.

https://www.youtube.com/watch?feature=player_embedded&v=nX2L-kS7ZL8