S1000RR valvetrain at full tilt

[wiggeywackyo]

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

[WordTooYoMamma]

Wirelessly posted (Tilt: HTC-ST7377/1.59.502.3 (67150) Opera/9.50 (Windows NT 5.1; U; en))

[R1]

[klepsta]

Wow. Thats sick.

[RyanNicholson]

thats insane

[nt650hawk]

amazing to see the springs and cap rotating around like that.

[wiggeywackyo]

It really is, at first I thought it was the sample rate of the video playing tricks on me and then i noticed the marks going around. Does that mean that the springs are literally floating for a moment as the lobe comes off the peak (correct term?)

[klepsta]

weird shit happens during vibration.

[nt650hawk]

It really is, at first I thought it was the sample rate of the video playing tricks on me and then i noticed the marks going around. Does that mean that the springs are literally floating for a moment as the lobe comes off the peak (correct term?)

Absolutely.

One reason of many reasons why F1 went pneumatic.

[Tricky Mike]

yeah, my thoughts exactly. It's nuts how much the springs rotate. It's amazing that the little tiny keepers stay in place though all of that.

Oil is an amazing thing, too... imagine the speeds and forces there and then try to imagine what the big end of the con rod is going through...

[stoinkythepig]

Neat, I love the way they moved the cams toward the middle of the head and made the lobes smaller by using the lever of the cam followers to increase the lift. Also, using followers completely does away with having to engineer the valves/springs/keepers/retainers for side loads (the sole purpose of "buckets") since all the side loads are applied to the followers, which can handle it with no problem at all.

How is valve lash adjusted on this engine? There's no bucket and I can't see any screw/locknut. There's a ton of articles on the web about how innovative the valve train is, but I cannot find any that mention adjustment. The only place I could envision a shim is right on top of the valve retainer, centered on the valve stem.

[Kurlon]

I think you have it nailed, small shim between the follower and valve stem, hiding in a recess made by the spring retainer cap. There are SOHC 4v heads for pitbikes that use a similar setup.

[stoinkythepig]

I read that they run the cam chain from a gear driven shaft, rather than directly off the crank. This allows for a much shorter cam chain and raises the resonant frequency of the chain itself. I imagine this dramatically reduces the cam chain tension and the friction of the chain on the chain guides. Very cool.

[stoinkythepig]

I think you have it nailed, small shim between the follower and valve stem, hiding in a recess made by the spring retainer cap. There are SOHC 4v heads for pitbikes that use a similar setup.

I wonder if they'll have a special tool for compressing the spings and taking the shim out with the cam in place like shim over bucket designs, that would rock.

I think I want one of these bikes.

[scottieducati]

And why Ducati MotoGP bikes made more power and used less fuel from the get-go.

Absolutely.

One reason of many reasons why F1 went pneumatic.

[wiggeywackyo]

And why Ducati MotoGP bikes made more power and used less fuel from the get-go.

So Ducati MotoGP bikes don't use Desmo?

[JalopySiR]

So Ducati MotoGP bikes don't use Desmo?

Yeah, they do. I think that's what he was saying. Ducati had desmodromics while everyone else still had springs.

[stoinkythepig]

Yeah, they do. I think that's what he was saying. Ducati had desmodromics while everyone else still had springs.

I think it's pretty widely known that Ducati uses desmo gear on their MotoGP bike for marketing purposes. There's no advantage to it but they need to keep using it to justify using it on their street bikes. It's neat engineering, but it complicates things that don't need to be complicated. I imagine the dealerships love it due to the maintenance revenue it generates.

I rather like how BMW simpified and improved an already simple design. That was clever.

[Kurlon]

Yes, it's of such little value that Honda hasn't been petitioning for RPM caps as a way of knocking Ducati down a peg in Moto GP... : )

[stoinkythepig]

Yes, it's of such little value that Honda hasn't been petitioning for RPM caps as a way of knocking Ducati down a peg in Moto GP... : )

One would think they'd have their sight set on Yamaha if they wanted to knock a company down a peg... Ducati has not dominated MotoGP in a couple of years. Not saying they can't dominate, just that the results have shown the desmo is not the only way to win.

[Kurlon]

One would think they'd have their sight set on Yamaha if they wanted to knock a company down a peg... Ducati has not dominated MotoGP in a couple of years. Not saying they can't dominate, just that the results have shown the desmo is not the only way to win.

When Stoner is on his game, the Duc is a hard package to beat... unfortunately only Stoner's been able to wrangle the beast. Hopefully this year it'll be a package that favors more riders.

[stoinkythepig]

Either way, with the way technology rapidly moves from MotoGP to street bikes, it really does not matter who wins the races, we all benefit from the competition. There are not too many motorsports that have such rapid movement of full-on racing hardware to off-the-shelf OEM street hardware. Gotta love that. With the new 2012 MotoGP rules, the technology will trickle down to the street even more quickly.

[Paul_E_D]

The duc is the ONLY bike left in MotoGP without pneumatics. That suggests that it is in fact superior to spring closing systems. they definitely had a rev advantage until the others went to air.

[R7]

Cool video, though i think a similar vid with an R6 going 4k rpm more than that would be more impressive