Ducati Desmosedici 800
For 2007, MotoGP rules were changed to cap motors to a maximum displacement of
800 cc. In response, Ducati built the GP7. Its specifications were: 800 cc bike,
double L-Twin motor (4 Cylinder Twin Pulse), approximately 168 kW (225 hp) at
19000 rpm and a greater than 330 km/h top speed (Confirmed 337.2 km/h (209.6
Ducati started its project to build an 800 cc MotoGP bike extremely early and
according to Ducati's racing chief Filippo Preziosi, by August 2006 Ducati had
already built twenty 800 cc engines with various specifications. In addition,
an early version of the bike was track tested for the first time during early
May 2006. Public testing with the bike began at the Brno Track, where Loris
Capirossi had won the day before riding the GP6, on the 21st of August.
Capirossi's lap times on the prototype GP7 were only 1.4 seconds off his track
record time set on the 990 cc GP6.
Further testing of the GP7 in Motegi, Japan, revealed that the 800 cc machine
could run faster laps than the higher-displacement 990 cc bikes, and held nearly
a second advantage over the next fastest 800 cc bike, a Honda ridden by Dani
MotoGP's 800 cc era officially began with the first race of the 2007 MotoGP
season, at the Losail International Circuit in Qatar. Casey Stoner won the race
on the new GP7. The bike had a clear top speed advantage over the rest of the
grid, due to its higher output motor. A new track record was set on the GP7.
Second place contender and five time former World champion, Yamaha's Valentino
Rossi, complained that "unfortunately, there was too much difference between
(our) bikes in the straight" and "Our Yamaha will never go as quick on a
straight as the Ducati." These words turned out to be true, as the GP7 enjoyed a
top speed advantage throughout the season, although the other manufacturers
(Yamaha, Honda, Kawasaki and Suzuki) closed the gap significantly by the end of
the year. Stoner and his Bridgestone-shod Ducati proved to be the top
combination in MotoGP and he won the world championship at Motegi, Japan, on
September 23, 2007, four races before the end of the season.
Casey Stoner's Ducati Desmosedici GP8
An evolutionary update of the GP7 design, Ducati's entry for the 2008 MotoGP
World Championship was tested first in February 2007.
For purposes of avoiding chatter which was encountered on some occasions with
GP7, the rigidity of the GP8's frame was altered, although further details of
relevant modifications are not disclosed. In addition, in an attempt to
reduce an effect described as "pumping", some modifications to the bike's
suspension geometry were made.
As with its predecessor the GP8 contains a four-cylinder 800cc engine with
desmodromic actuation of its 16 valves. The engine has improved mid-range
response and top-end power compared to that of the GP7.
During 2007 Ducati tested a special fuel saving clutch arrangement which
disengaged the clutch during braking and reduced fuel consumption, however the
arrangement was not incorporated in the GP8 as various advanced lubricants and
fuels used with the GP8 are believed to provide comparable fuel savings, while
decreasing internal engine friction and increasing maximum power.
In race trim the bike recorded an official top speed of 343.2 km/h (213.3 mph)
at the 2008 Chinese motorcycle Grand Prix. However, in a video of the same
race, Casey Stoner is seen to ride the bike at the speed of 347 km/h (216 mph).
The GP9 was Ducati's entry for the 2009 MotoGP World Championship. Ducati began
testing it on track prior to May 2008. On 9 June 2008, Ducati publicly rolled
out the Desmosedici GP9 for testing at Circuit de Catalunya.
A distinctive feature of GP9 is its carbon fibre chassis, representing a
departure from Ducati's traditional steel trellis chassis. Although carbon
fibre chassis were tried in mid 1980s, currently no other MotoGP racing team
The GP9 reached a speed of 348 km/h in the fifth round of the MotoGP
championship at Mugello.
On January 15, 2010, Ducati introduced the GP10 for the 2010 MotoGP season.
Development concentrated on improving engine longevity, to keep within new
engine restrictions, and rideability. Most notably, the GP10 makes use of a
big-bang firing order for the first time since the Desmosedici changed from the
990cc to the 800cc engine capacity. It also features redesigned fairing,
first seen at the 2009 Estoril round.
|Ducati Desmosedici GP11
||Liquid-cooled, 90-degree, V4 4-stroke
with 16-valve, Desmodromic DOHC
||Shell Racing V-Power
||Shell Advance Ultra 4
||Indirect Magneti Marelli electronic
injection, four throttle bodies with injectors above butterfly valves.
Throttles operated by EVO TCF (Throttle control & Feedback) system
||Approximately 170 kW (230 hp)
||Approximately 350 km/h (220 mph)
||6-speed cassette-type gearbox, with
alternative gear ratios available
||Dry multi-plate slipper clutch
|Chassis and running gear
||Carbon fiber chassis
||Öhlins inverted 48 mm front forks
||Öhlins rear shock absorber, adjuster for
pre-load, compression and rebound damping
||16.5 inch front and rear
||Brembo, two 320 mm carbon front discs
with four-piston calipers
||Brembo, single stainless steel rear disc
with two-piston calipers
||150 kg (330 lb)
||21 l (4.6 imp gal; 5.5 US gal)