BMW S1000RR Titanium Valves at 14,200 RPM
 

Quite an interesting video. Reaching revs an SV owner can only dream of :cool:

http://www.asphaltandrubber.com/bant...ves-14200-rpm/

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

I cant see the valves open! :p

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

thats incredable, doesnt even look like they are moving up and down at all! though at the end it looks like the spring is turning round, and thers much smoke/steam/oil somehting going on lol

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

That is awesome.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Wife just walked in, I'm sat there smiling like a Cheshire cat and she's like....WTF?! "You're looking at some metal making noise?".......wimmin:rolleyes:

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

I think the spring bits are supposed to move round so as not to get a wear point. Oil vapour I imagine, and that's what normally goes into the airbox and either gets burnt or condenses back.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Does the BMW redline at 14 odd or Top out at 14?

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

It's a standard development check to determine valve rotation vs engine speed to ensure satisfactory rotation. You don't want excessive rotation as it can lead to seat wear but you do want some rotation to take place during the normal engine speed range to maintain clean seats and good sealing.

You quite often see rotation reversal too, the graph of valve rotation vs engine speed can be a bit like a hockey stick, dipping negative then going positive as speed increases.

The driving force behind valve rotation is the balance between spring helix angle and usually valve tip/follower friction. At low speed the tip friction will usually prevent rotation, as speed increases the inertia unloads the contact at full lift and rotation begins earlier in the lift cycle so rotation rates increase.

For lower speed engines it's common to introduce low friction elements into the system in order to promote rotation at low speeds, first is multigroove collets which don't grip the valve stem (often only on exhausts), for very low speed engines positive rotators can be used ("rotocoil").

Interestingly the short pivoted finger follower as in this case is usually the lowest inertia design so most suitable for very high speed valve gear.

Good game.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

I just think it looked cool ;)

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Has anybody seen the new Black Eyed Peas video? BMW S1000RR features

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Because I love you all so much, I got the link:

http://www.youtube.com/watch?v=CUFsQ5lTo6g

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Thats pretty cool :)

Want it in super slow motion though so we can really see whats happening :D

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

I noticed the rotation in the video also, was wondering if it was just a trick of the camera. So thanks for the explanation Embee and thanks for the link Pete.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

omg

kleenex

this is just fantastic, a great find. thanks pete! Embee, what is generaly considered to be a "low speed" engine?

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Huge diesels, stationary engines, industrial stuff. Maybe big gennys, compressors etc.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Cheers embee

:smt081

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

lol

that vid is mad.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Here is some food for thought, the cams spin at half the speed of the crank! OMFG, I want to see how fast a piston is when the crank is at 14,200RPM!!!!!!!! Now that would be immense. :)

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Move your hand up and down 230 times a second, with all that jailbait you're not shagging I bet that won't be difficult:smt081

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

pmsl

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Wot he said ;)

Car engines rated at say 6000rpm tend to spend most of their lives at less than 4000 in reality, and it's nice to see some valve rotation before 3000. Cars doing the shopping/school run are the problem ones.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Thanks YC

:laughat:

aaaahhh i amuse myself in the most silly ways.

I notice my girlfreinds golf 1.6 (SR...ooo yeeaaaa...auto. Ah.) dosn't spend much time above 3000 rpm. I feel better when she takes it along the higher speed roads, but most of the time its just idling or humming along below 2000 rpm.

Is there anything we could be doing to promote good valve health in her car?

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Give it a good thrash once every so often when its nice and warm :)

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Like i said, she;s in traffic alot :lol: im not certain her insurance will take the excuse of "i was trying to clean my valves" too seriously when explaining the claim against her!

Although, I will instruct her to give it a bit more throttle from time to time. Hard in an auto though to keep the revs up without building excessive speed

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Just **** it off the lights a couple of times a week, it's revs the valves need not big throttle openings per se.

Lets face it you can rag the nuts off cars and not really do owt illegal they're that slow.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

That much is true, on my driving lessons I'm quite suprised at the amount of throttle required to get anything near respectable acceleration (comparing against a motorcycle). My driving instructor was also telling me to keep changing up a gear, which felt wrong for me...the car wasnt above 2000 rpm alot and I'm used to keeping an engine round 40-50% revs. Car engines are pretty good low down

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

That is amazing. Hard to believe anything can still work at those speeds!

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Drive something with a turbo, turbo rotor could be doing 120,000rpm.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

how do they not just eat the bearing surfaces? what lubricates? I can only imagine oil is not good enough

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Hydrodynamic bearings just same as main bearings on your bike, yup oil works.
Some use ball bearings or ceramic ball bearings too.

Oil shear depends on the oil film thickness, the oil doesn't care about absolute speed.

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

No idea what the speed of the actual valve is when the cam lobe pushes it. Rather rapid I imagine. Anyone got a guesstimation?

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

See if you can find specs about valve lift and duration and you can work out an estimate

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

More BMW S1000RR valve action

http://www.youtube.com/watch?v=Ed-l2Ot_d9c

Shows just how much rotation goes on :)

Re: BMW S1000RR Titanium Valves at 14,200 RPM
 

Thats interesting nice to see it from the other side.