Mercedes-AMG develops 426ps 2-liter four-cylinder

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Mercedes-AMG has unveiled its newly developed M 139 engine. Generating 426ps, the 2-liter unit is the world’s most powerful turbocharged four-cylinder in series production. Exceeding the M 133 by 41ps.

The maximum torque has also increased from 475Nm up to 500Nm. The four-cylinder will be available in two output versions, the 426ps S-model and 392ps in the basic version.

With response in mind, the torque curve was carefully balanced. The peak torque of 500Nm is available in a range of 5000-5250rpm. With this configuration, the AMG engineers have achieved a power delivery similar to that of a naturally aspirated engine.

The engine developers were also able to realize 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, AMG has given the M 139 a high maximum engine speed of up to 7200rpm.

“We already set the benchmark in the segment with the preceding engine. This fundamentally new four-cylinder presented us with the challenge of doing even better, and we succeeded with a number of sometimes revolutionary solutions,” said Tobias Moers, chairman of Mercedes-AMG.

“With the M 139, we have once again impressively demonstrated the engine expertise of Mercedes-AMG. Not only is the output per liter unrivalled for a turbocharged engine, the high level of efficiency also demonstrates that the internal combustion engine still has further potential.”

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Sam joined the UKi Media & Events automotive team in 2017. Having started out as assistant editor for a number of titles including Engine + Powertrain Technology International, Automotive Testing Technology International and Professional Motorsport World, he was appointed editor of E+PTI in 2020. Sam produces content for both the magazine and website.

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