a new multistrada

[alex.s]

http://www.bennetts.co.uk/bikesocial.../#.VEg1uWSwLHN

[LNasty]

that thing looks too small to be a 1200! Tires look like scooter tires

[choneofakind]

Because there's not a scale given in the picture to get you perspective. Look how massive the top end is, then look at the engine in the bike. That's a giant engine.

Also, how exactly are you seeing scooter tires...? You can't even see the width/profile?

[alex.s]

if the body of the multistrada was the same size as the ninja 250, those would definitely be scooter tires. but its like twice as tall.

[choneofakind]

Multistrada's are huge.

[LNasty]

the disc on the front are almost the same size as the rim. someone look up the size of the rims and tires please

[alex.s]

Originally Posted by LNasty

the disc on the front are almost the same size as the rim. someone look up the size of the rims and tires please

http://www.ducati.com/bikes/multistr...0/tech_spec.do

[alex.s]

all the links on ducati's website that go to anything multistrada are throwing 404 errors... hmm...

[choneofakind]

the page isn't working:
http://www.ducati.com/bikes/multistrada/1200/index.do

but no joke, what an exaggeration, yo! They're probably 320mm rotors on a 17" rim. Nothing exotic looking.

[LNasty]

wow, says 17" rims and 320mm! disc's

[alex.s]

whats the point of desmo valves if you still have to adjust the clearance?

[Desmoluci]

Originally Posted by alex.s

whats the point of desmo valves if you still have to adjust the clearance?

http://www.formula1-dictionary.net/desmodromic.html



If in a racing application a normal valve spring engine had an upper rpm limit of about 10,000 rpm, that same engine design when equipped with a Desmodromic valve system would be capable of 15,000 rpm, and much more power

[alex.s]

why doesn't the panigale rev to 20k then?

[Desmoluci]

Because it's already a desmo?

[alex.s]

i thought someone showed how modern springs don't have any of the issues that desmo valves fix?

[zhuuka]

Originally Posted by LNasty

that thing looks too small to be a 1200! Tires look like scooter tires

It be'z a big bike



I need to look up at him when we ride. lol

[Alex]

Originally Posted by alex.s

why doesn't the panigale rev to 20k then?

Desmo helps deal with valve float. Within its operating range, there is zero valve float as there is mechanical force pushing the valve back down to where it needs to be. It works right up until it breaks. That's compared to a valve spring, which has to be a compromise between being so stiff that it can fully close the valve in time at peak revs, while not being so stiff to cost power or be too brittle to survive for 100k miles. That used to be a very hard problem, but has become a much less taxing problem for street bikes.

Valve float isn't the only cause for a rev limit though; there are several other mechanisms in play that become dangerous at a certain speed. Max piston speed is another key one. At some point, the mass of the pistons rotating at speed exceeds the capability of the rods/crankshaft from keeping them from aerating the case (by blowing a hole right through that engine; makes for good pics ). That max piston speed is surprisingly constant across different engine sizes. A tiny 4 cylinder 250cc fourstroke running at 20k rpm, and a 1200cc vtwin running at 11k rpm, will both be running near that max piston speed (if i remember correctly, it's somewhere around 6000 fpm). Spin a panigale to 20k, and hope that the piston isn't aimed directly at the family jewels.

[alex.s]

have you heard of koeniggseggs "free valve" system? it uses hydraulics to independently control each valve. they say no float and no cam resistance and 100% fully adjustability in real time... electronically control valve overlap, valve timing, valve lift... whatever you want.

[alex.s]

https://en.wikipedia.org/wiki/Camless

[Alex]

Yup - there have been a number of attempts at running an engine without a camshaft altogether. Whether electrically powered, hydraulically powered, or pneumatically powered, triggering/controlling how and when a valve opens & closes is one of the key places to improve how an engine performs, in all aspects.

[Desmoluci]

Originally Posted by alex.s

i thought someone showed how modern springs don't have any of the issues that desmo valves fix?

That's true, but I think Ducati is bound by tradition to use desmodromics, for the same reason H-D is stuck using the tractor motors in their bikes.

Thanks for the link, I hadn't heard of that.

[Alex]

I believe the pneumatic-valve engines used in MotoGP for all the prototypes other than Ducati are still using a camshaft to open the valve; the pneumatic system just acts as the spring to close the valve faster than would be possible using a spring.

[alex.s]

@Alex got any infos on how this is implemented? link? diagram?

i've seen one valve system that actually had something like that internal to the valve itself

[Alex]

Here are some quick google links. I think I read it first in a Kevin Cameron column awhile back.

Link to original page on YouTube.

http://www.popularmechanics.com/cars...togp-2#slide-2

http://world.honda.com/RC-V/RC212V/report-engine/page2/

[Rogue]

The Multistradas aren't small, but for a touring bike they aren't huge.

Seeing them with the bags on, makes them look larger.



Without the hard luggage, they seem much smaller.



While they aren't the most exotic looking of the Ducs, they are quite versatile if you want to go from the street to the dirt and gravel without changing bikes.