New Mercedes-AMG A45 will have world's most powerful four-cylinder engine

Four wins: with an output of up to 310kW , the completely newly developed Mercedes-AMG 2.0-litre M 139 engine is the world's most powerful turbocharged four-cylinder engine in series production.

With this engine, Mercedes-AMG has even exceeded the previously most powerful M 133 by 30kW. Maximum torque has also increased from 475Nm to up to 500Nm. With an output per litre of up to 155kW , the new Mercedes-AMG high-performance turbo engine even ranks ahead of many well-known super-sports car engines.

The new, highly efficient powerpack is produced on an innovative production line in Affalterbach, on the "One Man, One Engine" principle.

The four-cylinder available in two output versions with 310kW (A45) as the S-model and with 285kW in the basic version. This product policy logic has already proved successful in the V8-powered AMG Performance models, and more closely meets customer wishes.

Apart from its performance figures, the new engine impresses with its immediate response. To this end the torque curve was carefully balanced ("torque shaping"): The peak torque of 500Nm (480Nm for the basic version) is available in a range of 5000-5250r/min (4750-5000r/min in the basic version).

Mercedes-AMG A 35 (W177), Sonnengelb, Kraftstoffve

        Mercedes-AMG A35                                                                        Image: Newspress

With this configuration, the AMG engineers have achieved a power delivery similar to that of a naturally aspirated engine for an even more emotive driving experience.

The engine developers were also able to realise a dynamically increasing torque curve in the lower engine speed range, thereby improving agility. The increasing torque at higher rpm makes the engine more free-revving. Moreover, the high maximum engine speed (up to 7200r/min). 

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Mercedes say the new twinscroll turbocharger combines optimum responsiveness at low engine speeds with a high power in the upper rpm range. In addition to this, the turbine housing is divided into two flow passages which run parallel to one another. Together with the likewise divided ducts in the exhaust manifold, this makes it possible to feed the exhaust flow to the turbine separately.