Most Powerful 4-Cylinder Engine, Mercedes-AMG's M139

[Franco Cozzo]

The turbocharged four-cylinder is available in two power output versions, able to produce 387 hp (285kW) and 421 hp (310 kW), respectively. The first powers “standard” AMG models while the second, which is the most powerful inline-four engine in production, is used for the top-shelf S versions.

It has been developed to be extremely agile and responsive and the designers carefully balanced the torque curve to achieve a power delivery similar to that of a naturally aspired engine.
The countless hours of hard work resulted in a peak torque of 500 Nm (369 ft-lb) for the S version and 480 Nm (354 ft-lb) for the basic model, which is available around 5000 rpm, while the engine’s maximum speed has been improved to 7200 rpm. This gives the small two-liter unit the agility and feel of a high-revving performance engine.

It has many improvements and innovative design features, like the new twin-scroll turbocharger that is extremely responsive at low engine speeds and provides a healthy dose of boost in the higher rpm range.

To achieve this, the turbine housing is divided into two flow passages that run parallel to each other while also receiving help from divided ducts in the exhaust manifold.

Additionally, roller bearings are fitted to the shafts of the compressor and turbine, an innovation that is borrowed from its famous AMG 4.0-liter V8 sibling. These bearings help minimize mechanical friction within the turbocharger.

To reduce friction between the pistons and cylinders, engineers opted to coat the linings using the patented NANOSLIDE technology that was pioneered on the Mercedes AMG Petronas Formula 1 engine.

Compared to its predecessor, the AMG M133, the new engine has larger exhaust valves that were made possible by repositioning and slightly angling the injection nozzles and spark plug system in the cylinder head.

https://www.autoevolution.com/news/a...39-150959.html

https://www.mercedes-amg.com/en/pres...tion/m139.html

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