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 Automotive Powertrain Technology International, Automotive Testing Technology International and Professional Motorsport World, he was appointed editor of PTI in 2020. Sam produces content for both the magazine and website.

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