2020 Ducati Streetfighter V4 S

STREETFIGHTER V4 S

The Panigale V4, stripped of its fairings and with high, wide handlebars. This, in short, is the underlying concept of the new Streetfighter V4, a bike that magnifies the thrill of the ride every time it takes to the road.

The result? An unrivalled naked bristling with cutting-edge technology and an awe-inspiring design that oozes pure performance.

The minimalist full-LED headlight captures the spirit of the Streetfighter V4 perfectly. On the one hand, it recalls the front of the Panigale V4 and, on the other, evokes the crazy grin of the Joker (the comic strip character from which the Ducati Style Center drew inspiration for this new Bologna-built naked). Already featured on the Panigale V4 and SuperSport, the V-shaped DRL is another clear Ducati hallmark.

HIGH POWER

The new Streetfighter V4 is powered by a 1103 cm3 Desmosedici Stradale engine. In this configuration the 90° V4 delivers 208 hp (153 kW) at 12,750 rpm, an unrivalled power level within the naked segment, perfectly in keeping with the all-out character of the new Streetfighter V4. Maximum torque is 123 Nm (12.5 kgm) at 11,500 rpm, practically unchanged with respect to the Panigale V4. Dedicated engine mapping lets riders safely make the most of Streetfighter V4 performance on the road.

The final ratio, shorter than that of the Panigale V4, delivers a wheel torque higher of +10%, which ensures an immediate response to the throttle command.

Power and torque can be raised to 220 hp (162 kW) and 130 Nm (13.2 kgm) by fitting the full-racing Ducati Performance exhaust by Akrapovic that also reduces weight by – 6 kg.

ENGINE

• V engine: For Ducati, the V4 layout at 90° is the utmost expression of sportiness for a motorcycle engine. It is no coincidence that it is the same solution used in the MotoGP Desmosedici engines.
• Compactness: Compared to a classic in-line four-cylinder, the lateral compactness of the V-engine allows greater centralisation of the masses and makes it possible to limit the weight on the front end of the bike. Furthermore, the shorter crankshaft generates a smaller gyroscopic effect. All these aspects have a positive impact on the bike's dynamics, helping to make it light and fast when changing directions.
• Integration of engine and chassis: The optimal integration of engine and chassis is a fundamental concept behind every Ducati project. That is why the Desmosedici Stradale was developed to be mounted rotated backwards by 42°, like the Ducati MotoGP engines, to optimise weight distribution, use more extensive radiators and to shift the swinging arm pivot forwards as much as possible.

CHARACTERISTICS

• Desmodromic system: Like all Ducati engines, on the Desmosedici Stradale the design of the Desmodromic system is a key factor for obtaining top performance. The Desmodromic system in the Desmosedici Stradale uses components that have been completely redesigned and miniaturised to obtain very compact heads, achieving a level of sophistication, compactness and lightness never seen before on a Ducati bike.
• Counter-rotating crankshaft: On normal motorcycles the crankshaft rotates in the same direction as the wheels. In contrast, in MotoGP the counter-rotating crankshaft rotates in the opposite direction. The Ducati engine specialists have borrowed this technical solution from the racing models for the same reasons it was applied in the competitive world. In fact, this solution has advantages related to two aspects of physics: the gyroscopic effect and inertia.
• "Twin Pulse" firing order: The 70° offset of the crank pins combined with the 90° V-engine layout generates a firing order that Ducati has called "Twin Pulse" because it is as if the engine were reproducing the firing sequence of a twin cylinder. The peculiarity lies in the rapid firing of the two cylinders on the left side and then on the right side of the motorcycle. In the timing diagram, the firings are situated at 0°, 90°, 290° and 380°. This particular firing order gives the V4 a sound that is quite similar to that of the Desmosedici MotoGP.

MATERIALS

• Magnesium: precious alloy: Magnesium occupies a prominent position among the lighter metal materials. It is not by chance that in alloy form it is widely used in competitions. The Desmosedici Stradale uses magnesium alloy for numerous components, including head covers, oil sump, generator and clutch. A technical choice that also has a positive impact on the bike's look.
• Aluminium: durability and lightness: The crankcases are made of aluminium using gravity die-casting and coupled with horizontal cut. The upper casing includes the four aluminium cylinder liners with nikasil coating that ensures low friction and protection against wear.

LIGHTNESS AND COMPATNESS

• Weight: The collaboration with Ducati Corse has made it possible to achieve a compact, lightweight and high performance engine. Weighing 64.5 kg, the Desmosedici Stradale is only 2 kg heavier than the 1,285 cm³ twin-cylinder Superquadro.
• Pistons: Pistons having a diameter of 81 mm churn in the barrels of the cylinders, with two piston rings, low friction, plus oil scraper ring. They are moulded in aluminium and utilise the "box in box" technology that makes it possible to contain the skirt height and the thickness under the piston crown thus reducing friction and inertia loads while maintaining the required durability and stiffness.
• Compression ratio: The compression ratio is 14:1, a high value that once again reflects a design of competitive origin. The pistons are coupled to steel forged rods with a centre distance of 101.8 mm..

GARBOX AND CLUTCH

• DQS Up & Down: changing gears like in a race: The perfect functionality of the six-speed gearbox is enhanced by the Ducati Quick Shift EVO (DQS EVO), which offers a fundamental evolution: changing gears with the throttle open. Furthermore, DQS EVO follows different logics to shift up and down. Integration with the slipper clutch and engine brake (Engine Brake Control) ensures the system's absolute effectiveness even on the track.
• Slipper clutch: The wet clutch with progressive control optimally combines high torque drive and rider comfort. In competitive riding conditions, with sudden downshifts and strong engine braking, the slipper clutch counteracts the loss of stability of the rear end, offering excellent control while braking deep in corners.

DYNAMIC FLUID

• Semi-dry casing lubrication: Like the MotoGP engines, the Desmosedici Stradale uses a semi-dry casing lubrication with delivery and recovery stages to ensure proper lubrication of all moving parts at all times.
• Cooling system: The water pump, located in the V of the cylinders, is powered by a shaft driven by a cascade of gear wheels. Its location is designed to reduce the size of the circuit as much as possible, improving its efficiency and optimising engine weight.