Mercedes-AMG announces world record-breaking engine
The M 139 engine is the most powerful four-cylinder ever produced in series production.
Mercedes-AMG has announced the world's most powerful turbocharged four-cylinder engine in series production, breaking its own record by 30 kW (41 hp).
The new Mercedes-AMG 2.0-litre M 139 engine has an output of up to 310 kW (421 hp), and maximum torque of 500 newton metres, up from 475. It's also got an output per litre of up to 155 kW (211 hp), making it more powerful than many of the most famous super-sports car engines.
The engine is being produced at AMG's headquarters in Affalterbach, Germany, and will be available in two versions, with the 310 kW (421 hp) for the AMG S-model, and 285 kW (387 hp) in the basic model. It will offer a power delivery in line with that of a naturally aspirated engine, and a maximum engine speed of up to 7,200 rpm.
Developed in line with Mercedes-AMG's "One Man, One Engine" principal, the M 139 is assembled entirely by hand using Mercedes-AMG's cutting edge production process.
Compared to its predecessor, the M 133, the new engine has been rotated 180 degrees around its vertical axis, meaning the turbocharger and exhaust manifold are now at the rear, with the intake system positioned at the front.
Tobias Moers, Mercedes-AMG chairman, says the engine has set new standards, but there may even be room for more improvement in the future. "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."
"With the M 139, we have once again impressively demonstrated the engine expertise of Mercedes-AMG. Not only is the output per litre unrivalled for a turbocharged engine, the high level of efficiency also demonstrates that the internal combustion engine still has further potential," he said.
Mercedes-AMG M 139 2.0 litre turbocharged four-cylinder engine specs
| Displacement | 1,991 cc |
| Bore x stroke | 83.0 x 92.0 mm |
| Output | 310 kW (421 hp) at 6,750 rpm (S-model) 285 kW (387 hp) at 6,500 rpm (basic version) |
| Peak torque | 500 Nm at 5,000-5,250 rpm (S-model) 480 Nm at 4,750-5,000 rpm (basic version) |
| Max. engine speed | 7,200 rpm |
| Compression ratio | 9.0:1 |
| Turbocharging | One twinscroll turbocharger with roller-bearing compressor and turbine wheels |
| Max. charge pressure | 2.1 bar (S-model) 1.9 bar (basic version) |
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