It also has a vertically split aluminum engine housing and triple plain bearing crankcase. 1.8-liter Big Boxer engine mounted on the BMW Concept R18 motorcycle The new power plant is air/oil cooled, has large ribbed cylinders and cylinder heads and weighs 110.8 kg (244.2 lbs) including the gearbox and intake system. The maximum engine speed is 5,750 rpm while the idling speed is 950 rpm.īMW Motorrad claims the Big Boxer engine offers “enormous pulling power” as well as “exemplary running smoothness” thanks to a generously sized flywheel mass. More importantly, more than 150 Nm (111 lb-ft) of torque is on tap from 2,000 to 4,000 rpm. Related: BMW And Japan’s Custom Works Zon Collaborate On R18 Bike With Mystery Boxer EngineĪs a result, it produces 91 PS (90 HP) at 4,750 rpm and a maximum torque of 158 Nm (117 lb-ft), already available at 3,000 rpm. It has a displacement of 1,802 cc resulting from a 107.1 mm (4.2 in) bore and 100 mm (3.9 in) stroke. It’s not hard to see why: the horizontally-opposed two-cylinder unit is the highest-capacity twin-cylinder boxer engine ever used in motorcycle series production. Now we get to know a lot more about the new power plant which the manufacturer calls the “Big Boxer.” Back in May, BMW Motorrad unveiled the Concept R18 bike at the Concorso d’Eleganza Villa d’Este as a stylish combination between old and new.Īlongside the retro appearance, the Concept R 18 also marked a return to the company’s roots thanks to a new boxer engine.
