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In spring valve trains the cams on the camshaft are used to open the valve and keep the valve from being closed too soon, but the valve is pulled closed by a spring.
In a desmodromic system a 'rocker arm' is fitted around the cam in a manner to both open and close the valve directly rather than relying on another system, such as a spring to close it. In that manner the cam completely opens and closes the valve, rather than just opening it.
The largest user of the technology is Ducati in (as far as I'm aware) all of their production motorcycles.
Fabio Taglioni developed it because at the time spring valves had problems at higher revolutions. The springs were prone to breaking, and you could get valve float, where the springs couldn't pull the valve closed fast enough before the spark and ignition of the fuel in the chamber ocured, meaning lost power through escaped gases and potential engine damage if the the piston collided with the still-open valve head.
At least that's how I understand it. Wikipedia has a pretty thorough article, though I think it could be cited more and cleaned up a lot.. a lot like my explanation I guess =p.
What else can I help you with?
What configuration do modern Ducati engines have?
Modern Ducati engines feature a Desmodromic valve system, L-Twin configuration, and variable valve timing. These engines are known for their high power output, torque, and distinctive exhaust note. Ducati engines are also equipped with advanced electronics and fuel injection systems for improved performance and efficiency.
What are the features of a Ducati 999?
The Ducati 999 features a 6 speed transmission system, 140BHP as well as a engine that utilizes the L-Twin cylinder, 4 valves per cylinder with Testastretta Desmodromic technology that enables the rider a fast smooth but enjoyable drive.
What is Valve pocketing?
Valve pocketing is when a valve is hammering the valve seat.mostly due to miss adjusted valve spring/wrong valve spring/to strong of a valve spring or valve stem to short.Makes the valve seat deeper.
What are the types of frogs valve?
tricuspid valve,bicuspid valve and pulmonary valve
What is used to lock a valve spring on a valve?
A valve spring "keeper" or AKA a valve spring "retainer" is used to lock a valve spring to the valve.
How do you replace the PCV valve on a 1998 Hyundai Elantra?
# The PCV valve is located in the valve cover # Detach the hose from the valve then unscrew the valve from the valve cover
What is a spill valve?
Spill valve is a overflow valve.
What valve is at the junction of the large and small intestines?
Ileocecal valve
The component in the cylinder head that holds a valve in place and prevents the valve stem from moving from side to side is. valve spring. valve guide. valve cover. retainer clip?
The valve guide is a precise hole in the head that the valve stem slides in. The valve is retained by the retainer and two valve locks.
2 other names for the bicuspid valve?
left atrioventricular valve and left mitral valve
What is the triscuspid valve?
the triscuspid valve is the valve in a bathroom sink.
What valve is exhaust and what valve is intake?
intake valve is bigger.
