The core.

The core.

For the first time, BMW ShiftCam technology is being used in a BMW Motorrad series engine – a technique for varying the valve timing and valve lift on the intake side. At the heart of this technology is a one-piece camshaft, which has two cam pair per actuated valve: a part-load and a full-load cam, each with different and optimally designed cam geometry. 

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Ingenious interaction.

Ingenious interaction.

While the part-load cam was developed with regard to consumption optimisation and smooth running, the full-load cam is optimised for performance. By use of an axial shift of the intake camshaft, the inlet valves are actuated depending on engine speed and load intensity - either with the part-load or full cam pair.This displacement – and thus the use of part-load or full-load cam – takes is initiated by a shift gateon the camshaft and an electromechanical actuator engaged there. 

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Efficient combustion.

Efficient combustion.

By means of the different design of the cam geometry, there is also a variation of the inlet valve. While the full-load cam provides the maximum valve lift, a reduced valve lift is available with the part-load cam. In the part-load cam, the inlet cams for the left and right inlet valves differ in stroke and angular position. This phase shift causes a time-delayed and varyingly wide opening of the two inlet valves. The advantage of this phase shift is that the fuel-air mixture flowing into the combustion chamber is more strongly swirled and effectively combusted – which, in the end, means optimal use of fuel. 

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Optimum oil supply, optimum fuel injectors.

Optimum oil supply, optimum fuel injectors.

If you increase power and torque, you must also optimise the oil supply. Of course, that happened: the two pistons have a bottom cooling using oil spray, and the lubrication system is equipped with a variable oil intake – the developers ensured optimum oil supply for all riding conditions and riding modes. And the BMS-O digital engine control is also new. Its main features are fully sequential injection, compact layout and low weight. The mixture preparation is taken over by an electronic fuel injection over throttle body with 52 mm opening width. New dual-jet injectors support an even higher running culture and even better emission values.

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Intermediate shaft compensates for vibrations.

Intermediate shaft compensates for vibrations.

As with the previous twin-cylinder Boxer engine, a balance shaft running with crankshaft speed also eliminates unwanted vibrations in the new power train. The balance shaft is designed as a hollow intermediate shaft, in which the clutch shaft runs simultaneously. This means that the new drive also runs comfortably and with low vibration over the entire engine speed range. The robust, twin-cylinder Boxer engine-typical basic characteristics are still maintained, while the performance data testify to its power: In the new generation, the twin-cylinder boxer engine has a peak output of 100 kW (136 hp) and a capacity of 1254 cc. 

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The Boxer Range

An engine with many faces.

The new 1250 BMW twin-cylinder boxer engine stands out for its versatility and, thanks to the BMW ShiftCam, is impressive in every riding situation and on every terrain. Each model of the new R 1250 series benefits from control, refinement, acceleration, sovereignty and higher performance from the new engine. Discover the benefits of the new model generation.

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BMW R 1250 GS

Thanks to the control in every engine speed range, you can take on every obstacle of your adventure with playful ease.

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BMW R 1250 GS Adventure

Smooth running and high torque in every speed range ensure a balanced engine culture on every long-distance journey.

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BMW R 1250 RT

The sovereign reserves of power of the new opposed-twin engine give you serenity on your next tour.

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BMW R 1250 R

With the new Boxer engine you have the necessary performance in every situation.

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BMW R 1250 RS

Powerful acceleration lets you master your next tour even faster.

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