Ducati Desmo Valve System

The Ducati Desmo Valve System was designed by Fabio Taglioni and is in part responsible for Ducati Motorcycle's spectacular performance. This animation illustrates how the Desmo Valve System works. Solid modelling and animation was done by Bluming Inc, and more information can be found at www.ducatidesmo.com

Category:

Education

Tags:

• ducati
• desmo
• motorcycle
• engine
• valves
• bluming
• ducatidesmo

[v8corvettec5]

The opening rocker is on the wrong cam!

[bisnonnocanapa]

the rpm limitation is made by 1- valve floatation 2- the limited rigidity of the engine structure,those are the main issues, since the desmo valves doesnt suffer from floatation, they can rev more, that means the desmo valves DO incide on the max amount of rpm! the spoon engines are built to be mutch more stable on the crankshaft, and they rev up to 10 000 rpm thats the secret,not the pistons mass ecc...

[Spyderd20]

@505197 In 1910, the Desmo was realized (however not mass produced) by Arnott, so the system (as a basic 1 cam) is not owned by Ducati; the system that they use on their bikes now (overhead 3 cam) has been patented many times over and is therefore exclusive to Ducati. The first mass production of the system was in 1968 with Ducati Mark 3 250/350. As for the RPM levels, it has nothing to do with the desmo system, hence the reason you didnt notice a difference between the motors with and without.

[123dhru]

verry very best to increase efficiency slightly but effort is 100% work

[viasevenvai]

@NH3R717 i guess it's called "a joke."

but that's ok.

[viasevenvai]

Don't act like you animated more than one rotation.

[505197]

@3000gtvr45Lebtt I agree with what you say, and it just reinforces my contention that you don't need a desmo valve train on a low rpm engine, it's just needless complication. I've ridden a Bimota and Multistrada, each seems about the same to me and one has springs. Neither was a high winder compared to other bikes. I believe if you do the calculations of piston speed, near 90* BTD/BDC, rod angularity plays a role, the piston mph will be a lot lower then one might think.

[3000gtvr45Lebtt]

@505197 the rpm depends on how big the pistons are, how long the stroke is, and how exotic the parts are. if its a 1000cc 4 cylinder the pistons are gonna be tiny and lightweight, that equals little mass so the pistons can move fast. same thing with f1 cars. a 3.5L v12 engine can obviously rev to 19,000-20,000 rpm cuz the parts are so small and well designed. only problem is the power is in the high rpm. ducs as far as i know are either single or twin cylinder engines, so more torque, less rpm.

[505197]

@Spyderd20 Desmo is older then internal combustion is, it was employed on steam locomotives. Ducati didn't invent it nor do they have any claim to any right to produce it. They do not have a stratospheric rpm operating level, so I don't really see any great need fo the complicated system. I've ridden ducks with springs and desmo and they both hit the limiter about 9 grand. You can take some spring engines to way more then that. Bikes typically run higher rpm then the desmo system on Ducs.

[kimiraikkonenwrc]

@joknrok,in F1 they have pneumatic valves(for some 30 years now)-just like Honda and Yamaha in Moto GP,no one use this type of valves cause they are like 50 years old and not so good,but Ducati is tradicional bike maker so they got this old technology,just like their bike frames wich is made out of tubes.