BMW Motorrad Introduces Big Boxer Version of R 18
BMW Motorrad introduced the 2-cylinder Big Boxer, which was developed by reinterpreting the brand's boxer engine.
In a range of motorcycles, the twin-cylinder BMW Big Boxer with the highest capacity ever used offers 1,802 cc engine volume, 107.1 mm diameter and 100 mm stroke. Producing 91 horsepower at 4,750 rpm, the engine delivers a maximum torque of 158 Nm from 3,000 rpm, while delivering over 150 Nm of torque from 2,000 to 4,000 rpm. The maximum speed of the engine with vertically separated aluminum motor housing is 5,750 rpm. The new Big Boxer with air / oil-cooled large grooved cylinders and cylinder heads has a total weight of 110.8 kilograms, including the gearbox and the air intake system.
Parallel to the role model of the past, two camshafts were placed left and right on the crankshaft in the Big Boxer. Thanks to this precise structure, a generally harder valve drive can be achieved with improved control accuracy and higher speed stability.
Self Supporting Single Plate Dry Clutch
As with most BMW Motorrad boxer engines, the single-plate dry clutch transfers the torque produced by the engine to the gearbox. The engine, designed for the first time as a self-supporting clutch against the bounce, eliminates the unwanted pressing effect of the rear wheel due to the engine's drag torque when the gear is shifted down sharply.
The 6-speed transmission with permanent synchromesh is designed as a 4-shaft gearbox with helical gear pairs in a double-compartment aluminum housing. The optional Reverse Gear can be changed manually by driving with an intermediate gear and an electric motor.