Tid-bit about engine vibrations

 blackSP    01 Apr : 09:01
 None    News

Fragment from an article about engine vibrations.

Fragment from an article about engine vibrations.

Precisely this is why the engine of the R 1200 GS is the first power unit in the history of the Boxer engine to feature a balance shaft: Running in the opposite direction, the shaft carries two balance weights 180° apart from one another and exactly spaced out in size to provide a counter-force which, superimposed on the mass forces in the crankshaft, reduces vibrations to an absolute minimum.

This keeps running conditions smooth and comfortable throughout the entire speed range, vibrations even being dampened in particular at low engine speeds without the flat-twin losing its bullish character.
The balance shaft itself is arranged exactly where it should be, saving space through its intelligent and elegant concept:

Running in anti-friction bearings, the balance shaft is positioned within the counter shaft and is driven by a spur gear from the crankshaft (1:1 transmission ratio).
The rear balance weight is outside of the oil cavity and is bolted on to the shaft extending completely from one end to the other. The front balance weight, in turn, is integrated in the drive sprocket.
Like on the former engine, the counter shaft again serves to drive the oil pumps and carries the sprockets driving the camshaft.
The transmission ratio of the counter shaft versus the crankshaft is therefore 2:1, the counter shaft itself being driven by a roller chain.

The HP2 benefits from not having a counter shaft. The engine revs much quicker and thus accelerates faster than the GS.

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