Overcam engine at 14k rpm

[tejkowskit]

Came across this video today. It's pretty cool! Crazy to actually see how fast our bikes are moving inside!
https://youtu.be/nsa6kq-qqIE

Edit: overHEAD cam at 14k rpm

 

[FinalImpact]

I've seen that before - amazing what technology can do!!

FWIW: Camshafts rotate at 1/2 crank speed so those cams are at ~7000 RPM as the Video describes engine as being at 14K redline...

 

[tejkowskit]

At 7000 its still moving so fast it looks like it's still! Cool to see how the springs spin. I remember you pointing out how buckets spin in my valve adjustment thread. Didn't realize how quick they actually spun!

 

[FinalImpact]

Yep, the lobes angle promotes rotation (its NOT 90°) which is what makes makes the spring and everything else rotate to save the cam to lifter contact surface!

Obviously cams used with roller style lifters are flat (90°) as they no longer have that shear action of the lobe wiping the bucket but a roller.

 

[phranK2k11]

WOW I may take it easier next ride!

 

[FinalImpact]

What fun would that be???

Some having over 50,000 and 100,000 miles on them - they used good materials! Enjoy it before something else happens to it!

 

[The_Paragon]

I've seen that before - amazing what technology can do!!

FWIW: Camshafts rotate at 1/2 crank speed so those cams are at ~7000 RPM as the Video describes engine as being at 14K redline...

Numbers that come to mind at 14,000 rpm:

A valve opens and closes 116 .6 times per second.
A crank revolves 233 times per second
A piston accelerates from a dead stop and decelerates to a dead top, ( @ 2x per crank revolution).. or 466.6 times per second.

 

[Johnny P]

That's pretty cool... :thumbup: