New 11217620981 Engine Crankshaft BMW 550i 650i 750i X5 X6 4.4L TT V8 N63

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Part number: BMW-11217620981 is a new, unused BMW engine crankshaft.

The crankshaft is one of the most typical and important parts of the engine. Its function is to convert the gas pressure transmitted from the piston connecting rod into torque and output it as power to drive other working mechanisms and drive the auxiliary equipment of the internal combustion engine to work. This means severe accelerations and decelerations with high bending deformations, high torques, and vibrational shocks, resulting in very high and variable stresses. Such extreme stress requires careful design and calculation, selection of appropriate materials, and batch processing. These stresses are concentrated at the fillet radius between the bearing journal and the balance weight web and on the oil hole, so special attention needs to be paid to the machining of these locations.