Want to see a BMW at 14,000 rpm?

[jduke]

BMW S1000RR Valves at Full RPM | Video | Ultimate MotorCycling

[signit98]

That video makes it clear what an incredible process is going on inside and engine... think about the timing, the things that happen in a time frame that is so short at 14200RPM, to me it's not even comprehensible...

Amazing...

[throttlemeister]

Valves open and close 'only' 78.6 times per second at that speed....

[1100s nut]

WOW! I don`t understand how oil or metal can withstand this rpm. I found myself backing away from the screen a little bit. Did not want a spring breaking and hitting me. I remember a few years ago BMW broke the...either 17,000 or 18,000 rpm barrier with their F1 engine. Of course F1 engine is not one you can pull of the self like the one shown. Thanks Jerry.

Lane

[gs mack]

Originally Posted by throttlemeister

Valves open and close 'only' 78.6 times per second at that speed....

Howe did you get to that number i get a higher #

14200 rpm divided by 2 = 7100 divided by 60 sec =118.3

Hans

[Droptarotter]

That is incredible.........now can we see a Davidson valve train at that speed?
Cheers

[Guest24]

Smokin'!!!!!


It's hard to understand how the metal in the valve springs keeps its memory.

[Guest24]

Originally Posted by signit98

That video makes it clear what an incredible process is going on inside and engine... think about the timing, the things that happen in a time frame that is so short at 14200RPM, to me it's not even comprehensible...

Amazing...

Ralf, just consider what it takes to achieve variable valve timing.

[tim22]

OMG!!

I never knew! I have no words, but I'll try. No wonder light weight is such an important factor in the valve train! The engineering that goes into something like that is staggering. It's a miracle anything like that can stay together. And oh, the metallurgy, lubrication, cooling, tolerances...........What a feeling one must get to be part of a team that created something such as that!

[shreddr]

as a professor of chemistry I will try to put this "feat" of human engineering into perspective.

consider a simple hydrogen atom, which has 1 proton and 1 electron, thats it. the radius of this atom is 1 billionth of an inch. the proton is at the center and the electron flys around it somewhat haphazardly in a spherical "shell". the speed of the electron is just shy of the speed of light which is 186,000 MILES per SECOND, or 10 billion inches per second, do you see the enormity of scale?

the bottom line is that, because of the rate of speed, and the miniscule size, the electron is essentially everywhere at once.

to further put the sense of enormity on this, 1 gram (454 grams are in a pound) of hydrogen (nothing) contains 602,000,000,000,000,000,000,000 atoms of hydrogen.

so while man has clearly made some cool stuff, the really cool stuff was here at the beginning of time.

put that in your pipe and smoke it for a while

[Digger33]

Bubba, I work for a company that produces titanium bars (.375" dia. up to, and beyond 18.000" dia.) and what some of my customers are doing in automotive applications are phenominal. On the other end of the size scale from these valve springs, you should see the suspension springs they're making for big trucks and equipment... coiled 2.000" (!!!) diameter.

BTW, if any of the Pelican community wants to try fabricating Ti parts, give me a shout... I can get you some input bar stock on the cheap... and hurry, because prices are going up fast, so "cheap" will be a very subjective term.

[signit98]

I want to make some Ti knee and toe sliders... need some 1/4" rod... but really only a foot or so!?

[Digger33]

3/8" is the smallest we produce, Ralf... I'd have to see if we've got any in process and that's not one of the more common sizes through our mill. Let me know if that might work for you and I can see what I can get my hands on.

[tim22]

Originally Posted by shreddr

as a professor of chemistry I will try to put this "feat" of human engineering into perspective.

consider a simple hydrogen atom, which has 1 proton and 1 electron, thats it. the radius of this atom is 1 billionth of an inch. the proton is at the center and the electron flys around it somewhat haphazardly in a spherical "shell". the speed of the electron is just shy of the speed of light which is 186,000 MILES per SECOND, or 10 billion inches per second, do you see the enormity of scale?

the bottom line is that, because of the rate of speed, and the miniscule size, the electron is essentially everywhere at once.

to further put the sense of enormity on this, 1 gram (454 grams are in a pound) of hydrogen (nothing) contains 602,000,000,000,000,000,000,000 atoms of hydrogen.

so while man has clearly made some cool stuff, the really cool stuff was here at the beginning of time.

put that in your pipe and smoke it for a while

I don't smoke.

(Sorry Shreddr, I couldn't resist. We're still friends, right?)

[bacn5]

So did anyone else notice the springs rotating at high rpms? To me that indicates some level of reduced tension/ float/ or spring oscillations, which is not a good thing. Even worse was that one of the retainers rotated separate from the spring.
I believe the purpose of the test was to check for this, due to the red line painted on the retainer and spring. The keepers stayed in place, so all is well - for now.

[PFFOG]

Rotation of springs is normal as far as I know. I have worked on a lot of motors, and most of the springs rotate, even small Briggs and Stratton L head motors. You definitely want the valve to rotate to keep wear even.

[signit98]

Originally Posted by Digger33

3/8" is the smallest we produce, Ralf... I'd have to see if we've got any in process and that's not one of the more common sizes through our mill. Let me know if that might work for you and I can see what I can get my hands on.

3/8" is fine as well..... just let me know. Thanks....

[SergioK]

Based on my experience I need a bike slider... how thick would it need to be for a 40mph highside?

[KMoore]

Originally Posted by bacn5

So did anyone else notice the springs rotating at high rpms? To me that indicates some level of reduced tension/ float/ or spring oscillations, which is not a good thing. Even worse was that one of the retainers rotated separate from the spring.
I believe the purpose of the test was to check for this, due to the red line painted on the retainer and spring. The keepers stayed in place, so all is well - for now.

I have worked on engines that were engineered to rotate the valves to reduce uneven wear and cooling and it also can reduce carbon build up that may lead to incorrect seating of the valve. In a high performance engine like this one, it may be beneficial to rotate the valves to reduce hot spots on the exhaust valves due to exhaust port shape?

[bacn5]

Originally Posted by PFFOG

Rotation of springs is normal as far as I know. I have worked on a lot of motors, and most of the springs rotate, even small Briggs and Stratton L head motors. You definitely want the valve to rotate to keep wear even.

I was always under the impression that the spring should not rotate but the valve could , for even wear? Are you referring to even spring seat wear?