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september 08, 2017 - Ducati

Desmosedici Stradale: the new Ducati V4 engine

Out of the experience gained in MotoGP comes the new 90° V4 engine, designed to power future top-ofthe-range #ducati sport models. Called the #desmosedicistradale, this new power unit is a milestone for the Bologna-based motorcycle manufacturer. Once again, #ducati has looked to the future by developing a fresh, distinctive project, opening up an entirely new chapter. The starting point for the #desmosedicistradale design was the heart of the V4 MotoGP engine - its cylinder heads. With the same dimensions and geometry as the Desmosedici GP, the #desmosedicistradale offers the same outstanding fluid dynamics. It also has the same engine configuration: 90° V4, rotated rearward by 42°. This solution makes the new #ducati engine extremely compact, allowing centralisation of mass and perfect integration with the vehicle. As on #ducati competition bikes, the crankshaft is the counter-rotating type. This reduces the gyroscopic effect exerted by the wheels and makes the bike faster and more agile when changing direction. It also reduces the wheelie effect when accelerating and rear wheel lift when braking. The crank pins have a 70° offset, giving rise to a “Twin Pulse” firing sequence that, in addition to producing a unique signature sound, delivers easy-to-handle power and excellent out-of-the-corner traction. While the #desmosedicistradale 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. The #desmosedicistradale is designed around the Desmodromic system that controls the four valves in each cylinder and plays a key role in making #ducati prototypes the fastest in MotoGP. On this highrevving engine the “Desmo” system achieves a degree of sophistication, lightness and compactness never before seen on a #ducati. As in MotoGP, the engine was designed with an 81 mm cylinder bore. This measurement reflects the maximum limit allowed by MotoGP rules; it's 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 inengine fluid dynamics (i.e. on valves, intake ducts and throttle bodies, right where the power is produced). Throttle bodies have variable-height air intake horns that optimise cylinder intake across the rev range 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 technical solutions package - born in MotoGP and developed to maximise everyday reliability - once again demonstrates the uniqueness of #ducati, capable of creating a V4 engine that offers a configuration and a solutions set like no other in the motorcycle world.

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