Amazing S1000 RR valvetrain video - BMW Luxury Touring Community
 
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post #1 of 7 Old Feb 20th, 2010, 7:53 pm Thread Starter
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Amazing S1000 RR valvetrain video

http://www.autoblog.com/2010/02/19/v...wes/#continued

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post #2 of 7 Old Feb 20th, 2010, 9:28 pm
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Re: Amazing S1000 RR valvetrain video

Great video! You know the cam lobes have to beat the crap out of the valves but watching it happen really brings it home. Sure was glad when they finally backed down the throttle!

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post #3 of 7 Old Feb 20th, 2010, 10:11 pm
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Re: Amazing S1000 RR valvetrain video

I can see that a metal cap at the end of the valve spring appears to be turning. Does that mean that the valve stem, and hence the valve, is also turning?

- Bob

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post #4 of 7 Old Feb 20th, 2010, 11:27 pm
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Re: Amazing S1000 RR valvetrain video

Thus we witness first hand the reason why Ducati developed the desmonic valve train

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post #5 of 7 Old Feb 20th, 2010, 11:49 pm
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Re: Amazing S1000 RR valvetrain video

Much better if can show the rpm at the same time.

Thank you for your sharing
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post #6 of 7 Old Feb 21st, 2010, 6:30 am
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Re: Amazing S1000 RR valvetrain video

Quote:
Originally Posted by bob_menton
I can see that a metal cap at the end of the valve spring appears to be turning. Does that mean that the valve stem, and hence the valve, is also turning?

- Bob
Yes. On most engines the valves are meant to turn slowly to keep wear even. On engines like our current LT, the followers turn (but not necessarily the valves). If you look at the tops of the followers when you do a valve check you will see that the wear is even all around the top of the follower, not in-line with the cam lobe. On many engines the cam surfaces are ground at a very slight angle to cause this by more pressure on one side of the lobe than the other.

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post #7 of 7 Old Feb 21st, 2010, 8:37 am
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Re: Amazing S1000 RR valvetrain video

It would be nice to see it done with high speed video & then slowed down to see what the springs look like at high RPM. We can slow our video down of our valve springs at work so that one revolution at 10,000 rpm takes several seconds to see. It's amazing to see the spring deform side to side & leave the spring seat each revolution then settle back to it's original shape before it starts the cycle all over again.

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