valves at 14000 rpm

[captainrob]

I pinched this off facebook
Ive never seen it before and found it interesting - sort of blows your mind!

https://www.youtube.com/watch?v=T6RURvzNXxE

P/s: look at 0:58 onwards... valve start spinning...

The valves cycle at half the speed of the engine's crankshaft, so at 9000 rpm the valves open 4500 times per minute.
The peak rpm that we can see here is at 14000 rpm, so the valve will open 7000 times per minute, or 116.66 times per second

[Batfink]

it's pretty amazing to see actual theory in action...

[Big_Dan_T]

good reason to keep on top of servicing hey

[captainrob]

I pinched this off facebook
Ive never seen it before and found it interesting - sort of blows your mind!

https://www.youtube.com/watch?v=T6RURvzNXxE

P/s: look at 0:58 onwards... valve start spinning...

The valves cycle at half the speed of the engine's crankshaft, so at 9000 rpm the valves open 4500 times per minute.
The peak rpm that we can see here is at 14000 rpm, so the valve will open 7000 times per minute, or 116.66 times per second

and all that mayhem is happening half meter underneath your nut sack!

[Batfink]

don;t forget that all that activity is being delivered by chemical explosions in an enclosed space at double the intervals per revolution

[Hayabusabike]

I just had a little accident watching that....

[Aussie Steve]

Kept waiting for a gear change....

[Shifu]

don;t forget that all that activity is being delivered by chemical explosions in an enclosed space at double the intervals per revolution

You mean half per revolution surely

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[quote='captainrob' pid='301829' dateline='1403827256']

P/s: look at 0:58 onwards... valve start spinning...

The spinning is good for them. The camshafts' lobes are specially ground on a slight angle to induce the valve rotation.

[Batfink]

You mean half per revolution surely

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1/2 per revolution times 4 cylinders = 2 explosions per revolution

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BTW.. welcome back to the road shifu

[captainrob]

[quote='Batfink' pid='301833' dateline='1403834710']
don;t forget that all that activity is being delivered by chemical explosions in an enclosed space at double the intervals per revolution

You mean half per revolution surely

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P/s: look at 0:58 onwards... valve start spinning...

The spinning is good for them. The camshafts' lobes are specially ground on a slight angle to induce the valve rotation.

why is that, shifu?
I have no idea why that would be good - does it reduce wear?

[Batfink]

shifu will know better but as I see it the rotation shoudl reduce effects of "hot spots" create a more even wear pattern on both seats and valves plus possibly help remove any build up on either part..

was I close shifu??