Valve Desmodromic (Ducati Desmosedici)

In the traditional spring valve system, valve opens
driven by the camshaft (or rocker arm I also moved
by camshaft lobe and the position of the piston, when the piston spring ride
/ Spring close the valve so that it is, however feebleness
is the spring can not compensate if the RPM has been reached
high, so that when the valve was not closing, it is punched
by piston, this valve can lead to despair.
To overcome that, in a system that is developed
Pneumatic valve, with valve desmodromic, the Pneumatic
valve, valve closed with a high pressure gas. Gas used
Nitrogen is, as it is not so sensitive to temperature
compared to oxygen. Pressure and provided approximately 100 psi.
Because the pressure is almost constant so that the weaknesses per
tend to go. Application of Pneumatic this charge is used in the circuit and
can not be applied to the street bike. Pressure in each valve
on each cylinder must be the same. If not, one of the cylinder valve is
can return by punched piston.
Producing in desmodromic valve system is very expensive
for mass produced, so this system is only used by the
Ducati.