BMW Motorrad launches fast, light, DOHC Boxer and intends to go racing
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Image Gallery ( 58 images )The horizontal arrangement of the camshafts introduces two special features: Each of the shafts controls an intake and outlet valve and the cams are conically ground. For a higher gas throughput, the valve plate diameter was increased from 36 to 39 millimetres (intake) and from 31 to 33 millimetres (outlet) respectively. The intake channels were machined for optimisation. The operating technology with drag lever works with shims sitting on the valves as in the K 1200 engines.
The cylinder head covers are made from carbon and fitted with easy-to-replace slip pads made from PA6 hard plastic.
High-strength and lightweight forged piston
The bore and stroke ratio is unchanged in the HP2 Boxer. The high-strength, weight-reduced forged piston and the correspondingly adapted conrod are new. Interacting with the new intake pipe system with its a short intake air funnel, the power plant develops a top performance of 96 kW/128 hp at 8750 rpm and a maximum torque of over 115 Nm at 6000 rpm.
Flow through two parallel and consecutively switched oil coolers
So that the Sport Boxer operates well under all conditions from the thermal aspect, two oil coolers positioned one after the other and with a parallel flow-through are deployed. Wind tunnel optimisation of the BMW ‘kidneys’ in the front fairing ensures an effective flow through the double oil cooler.
Stainless steel exhaust system with active exhaust gas flap
For the first time the 2-in-1 exhaust system made completely from stainless steel is placed under the oil sump. This configuration guarantees optimum angles of tilt when riding. An exhaust flap in front of the double exhaust pipe silencer at the rear and actuated by an electronically controlled servomotor via cable produces a fuller torque curve.
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