2023 Author: Eric Donovan | [email protected]. Last modified: 2023-11-27 05:39
The two-cylinder boxer engine from BMW is valued by customers around the world. Now the Munich-based company has revised the unit and is presenting it in the R 1250 GS and the R 1250 RT.
Most recently, the developers achieved a new level of performance and comfort in 2013 with the presentation of the first partially liquid-cooled boxer engine. With the new ShiftCam technology at BMW Motorrad, variable valve control is now finding its way into a Bavarian motorcycle engine for the first time. It is used in the R 1250 GS and the R 1250 RT.
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This is intended to improve the running behavior of the engine, which has been enlarged to 1254 cubic centimeters, combined with a powerful increase in performance: Instead of 125 hp, the unchanged 7750 rpm now offers 136 hp, and the maximum torque increases from 125 to 143 Newton meters at 6250 rpm.
BMW R 1250 GS with better smoothness
With the variable control, valve timing and valve lift are no longer fixed over the entire engine speed range. The heart of this technology is a one-piece inlet camshaft, which has two cams for each valve to be actuated: a part-load and a full-load cam, each with a different cam geometry.
With the partial load cam, consumption and smoothness are optimized, with the full load cam, performance is paramount. The axial displacement of the inlet camshaft takes place via a shift gate on the camshaft and an electromechanical actuator located there. In this way the inlet valves are activated by one of the two cams. With the full load cam, the entire valve lift is available, with the part load cam only a part of it.
With the help of the shift cam technology, the intake valves also open asynchronously so that the injected gasoline-air mixture receives a special twist, which leads to improved combustion. Lower emission values are the most desirable effect with regard to the future Euro 5 standard, plus a four percent reduction in consumption. In view of the performance data, the consumption of an average of 4.75 liters of petrol per 100 kilometers is a remarkably good value. (SP-X)
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