Ducati Stradale V4 engine
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Overview
Ducati Stradale V4
Ducati have unveiled the Desmosedici Stradale, an 1103 cc,
90° V4 Big Bang engine. Ducati is claiming 210 horsepower at
13,000 rpm, as well as a plateau of torque near 90 foot/pounds
covering 8,750 rpm to 12, 250 rpm!
As with all Ducati engines, on the
Desmosedici Stradale the design of the Desmodromic system is a key
factor for obtaining top performance. Its components have been
completely redesigned and miniaturized to obtain very compact heads,
achieving a level of sophistication and lightness never seen on a
Ducati bike before.
This is the street version of the motor displacing 1,103 cc,
while a sub-1,000 cc engine will be homologated later for use in WSB
from 2019 forward.
The motorcycle housing this new engine will be known as the
Panigale V4.
Here is the press release from Ducati,
Called the Desmosedici Stradale,
this engine is set to become yet another Ducati milestone: it will
be the first time ever that the Bologna-based motorcycle
manufacturer has equipped a standard production bike with a
4-cylinder engine.
Its with undiluted pride that we
unveil this technological gem. It represents the start of a new
chapter for our company, underlining our vitality and an unshakeable
commitment to investment in new products, stated Claudio Domenicali,
Ducatis CEO, during the presentation of the Desmosedici Stradale.
This engine also highlights the close collaboration between Ducati
Corse and the factory bike development team, proving just how
instrumental racing can be in developing the technology that is
later applied on production bikes. In November, at EICMA, well be
showcasing the new Panigale V4, an all-new motorcycle powered by
this extraordinary engine.
While the Desmosedici Stradale
engine is undoubtedly suited to the track, it has also been designed
to respond to the needs of the road rider. For example, to maximise
mid-range torque essential for a satisfying road experience and
ensure punchy torque and power at lower revs, the engine has a
slightly larger displacement than its MotoGP counterpart (1103 cm³,
to be precise). Power output from the Euro 4 compliant engine
configuration exceeds 155 kW (210 hp) at 13,000 rpm while maximum
torque exceeds 120 Nm (12.2 Kgm) from 8,750 to 12,250 rpm.
An R version with a displacement
of less than 1000 cc which revs higher and is intended more for
track use is currently at the advanced development stage. This
will provide the foundation for the homologated version that
competes in the Superbike championship, where this engine will be
used starting in 2019 (one year on from the launch of the respective
road version, as per the Ducati tradition).
As on the Ducati bikes used in
racing, the crankshaft is of the counter-rotating type. This reduces
the overall gyroscopic effect and makes the bike faster and more
agile when changing direction.
The crank pins, offset at 70° as
on the Desmosedici GP, involve a Twin Pulse firing sequence that
generates easy-to-handle power delivery and optimises
out-of-the-corner traction (Big Bang effect). This firing sequence
also gives the Desmosedici Stradale a unique signature sound.
A 90° V4 configuration makes the
engine extremely compact, allowing centralisation of mass and
smoothing incorporation on the vehicle. The Desmosedici Stradale
has, in fact, been inserted on the motorcycle with the front
cylinders banked 42° back from the horizontal, just like the Ducati
engines employed in MotoGP. This, of course, optimises weight
distribution, allows the adoption of larger radiators and brings the
swingarm pivot point forwards.
Its architecture also evens up
first order forces naturally without the added weight and power loss
that a balancing countershaft would involve.
As in MotoGP, the engine was
designed with an 81 mm cylinder bore. This measurement reflects the
maximum limit allowed by MotoGP rules; its also the highest in the
4-cylinder supersport segment.
Using the same bore as the
Desmosedici GP engine means both power units share nearly identical
in-engine fluid dynamics (i.e. on valves, intake ducts and throttle
bodies, right where the power is produced).
Needless to say, the new engine is
designed around the Desmodromic system, a key characteristic that
helps make Ducati prototypes the fastest in MotoGP. On this
high-revving engine the Desmo system achieves a degree of
sophistication, lightness and compactness never before seen on a
Ducati.
Variable-height air intake horns
constitute another first for a Ducati factory bike, optimising
cylinder intake across the rev range and giving significant
advantages in terms of power delivery and handling. Completing the
fuelling system are the oval throttle bodies, each equipped with two
injectors: one above the butterfly and one below it.
This package of cutting-edge
technical solutions absolutely unique within the Supersport
segment makes the Desmosedici Stradale an engine like no other in
the motorcycle world.
Main technical data:
1,103 cm³ 4-cylinder 90-degree V Bore x stroke 81 x 53.5 mm Compression ratio 14:1 Maximum power exceeds 210 hp at 13,000 rpm Maximum torque exceeds 120 Nm from 8,750 to 12,250 rpm Counter-rotating crankshaft Twin Pulse firing sequence, crank pins offset at 70° Euro 4 emissions Desmodromic part chain, part gear timing with dual overhead camshaft, 4 valves per cylinder Wet multiplate anti-patter servo clutch Semi-dry sump lubrication with four oil pumps: 1 delivery and 3 return Fuelling with four oval throttle bodies (52 mm diameter equivalent) and variable-height intake horns 6-speed gearbox with DQS up/down system 24,000 km Desmo-service maintenance interval (15,000 miles)
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