The Powertrain for the New C63 AMG

Authors

Dipl.-Ing. F. Eichler, Dipl.-Ing. A. Fürschuss, Dr.-Ing. M. Hart, Dipl.-Ing. R. Schaich, Dipl.-Ing. B. Tschamon, Dipl.-Ing. R. Illenberger, Dipl.-Ing. M. Glose, Dipl.-Ing. W. Zimmermann, Mercedes-AMG GmbH, Affalterbach

Year

2008

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 672

Summary

Based on the AMG M156 engine first installed when the ML63 was launched in December 2005, a highly performance-oriented and exciting engine concept for the new C63AMG has been created in combination with the NAG2 7-speed torque converter transmission.


The 6.2-liter M156 engine represents the first engine development carried out completely in-house at AMG that is not based on a base engine from parent company Daimler. The engine is characterized by specific low weight, outstanding horsepower and torque numbers and willingness to rev despite its large-displacement cylinders. Special attention has been paid to efficient combustion and a high degree of mechanical efficiency. The LDS process used for the first time in a production engine for cylinder wall coating, in combination with an extremely stable liner structure, made a significant contribution.


The engine is very compact for a displacement of this size as the result of a space-saving design for the cylinder heads and the crankshaft. The engineers were able to find space for the engine within the narrow design limitations of a luxury mid-size vehicle. The top engine version of the new C-class is the leader, ahead of its relevant competitors with respect to horsepower, torque and efficiency in the real-life cycle.


The apparently conflicting goals of a very sporty drivetrain layout with properties such as agility, willingness to rev and quick shift speeds on the one hand, and comfort-oriented features such as effortless pulling power, low NVH levels and gentle shifts on the other were able to be resolved by a variable shift strategy specially tailored to the engine. Active torque request during downshifts underlines the exciting qualities and the sporty nature of the transmission to a special degree.

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