BRUTALE 990R Engine
The engine size has increased from 982.3 cc to 998 cc without any variation in layout. The cylinder bore and stroke have gone from 79 x 50.1 mm to 76 x 55 mm. The reconfiguration of the 4 cylinders, with 16 radial valves, seeksto make power delivery smoother, with a response that is more progressive, solid, and harmonious than before, especially when opening-closing and when accelerating. For this purpose, a new 46 mm Mikuni throttle body assembly, with a non-return feed that is 0.33 lbs lighter than the previous one, has been installed. The new throttle body assembly is operated by Marelli 5SM electronics, which perform better than the previous, and which feature new software for such things as traction control (for which 8 adjustments can be made) and a double EFI map. No alterations have been made to the materials, measurements, and profiles used on the thermal side, but the new electronics allow for the elimination of the position sensor of the camshaft. The completely redesigned engine crank case is 1.32 lbs lighter than the previous one, and is fitted with a counter-rotating balancing shaft to resist high-frequency secondary vibrations, which has been placed at the front of the engine and is driven directly by the primary transmission gear. While the transmission ratios remain the same, the internal gearbox command mechanism is entirely new, redesigned to allow adopting a gear sensor, and to provide a smoother and more comfortable shift of the lever. Using this new sensor, the engine control unit is ableto optimize the injection and ignition calibrations and the position of the exhaust valve according to the demands of the individual gears. There is also a new Mitsubishi, Neodymium-Iron-Boron generator, cooled by a high pressure internal oil jet, which - together with the new transmission system and a damper that incorporates an elastomer vibration canceling system - contributes to saving a full 3.52 lbs.
The lubrication circuit has also been entirely renewed, with a double rotor pump which is smaller and lighter (by 0.75 lb), but more efficient than the previous one. The circuit is no longer divided, as it was before, and the pump serves the radiator and the engine which are placed in series. The new oil filter has an environmentallyfriendly paper element, which is easy to access without dismantling any part of the engine, thereby reducing maintenance time. The water pump, too, has been completely redesigned, and although it is 0.13 lb lighter than the previous one, its cooling capacity is up to 65% greater at low revs. Engine performance has been optimized to improve drivability and power delivery, which are further enhanced by the new exhaust system, which has a choke valve operated by the injection control unit.
BRUTALE 1090RR Engine
The top model shares all of the basic characteristics of the 990, but has a 1078 cc engine offering even greater power and performance. The RR differs from the 990 model in its considerably larger engine size, and also its slipper clutch, which is an original MV design.