| Mercedes-Benz M139 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-AMG |
| Production | 2019-present |
| Layout | |
| Configuration | Straight-four engine |
| Displacement | 2.0 L (1,991 cc) |
| Cylinder bore | 83 mm (3.27 in) |
| Piston stroke | 92 mm (3.62 in) |
| Cylinder block material | Aluminium alloy |
| Cylinder head material | Aluminium alloy |
| Valvetrain | DOHC |
| Compression ratio | 9.0:1 |
| Combustion | |
| Turbocharger | One twin-scroll, electrically assisted |
| Fuel system | Combined Direct and Port Fuel Injection |
| Fuel type | Gasoline |
| Output | |
| Power output | 285 kW (387 PS; 382 hp) base version 310 kW (421 PS; 416 hp) S-model |
| Torque output | 480 N⋅m (354 lb⋅ft) (base version) 500 N⋅m (369 lb⋅ft) (S-model) |
| Dimensions | |
| Dry weight | 160.5 kg (354 lb) |
| Chronology | |
| Predecessor | Mercedes-Benz M133 engine |
The M139 is a turbocharged straight-four engine produced by Mercedes-Benz. It serves as the successor to the M133 engine. It is the first AMG four-cylinder engine to feature two distinct output levels, be assembled by hand under the "one man, one engine" philosophy, and utilize a combined port and direct fuel injection system. At 310 kW (416 hp), upon its introduction, the M139 was the world's most powerful four-cylinder engine in serial production, achieving a specific output of 155 kW (208 hp) per litre or 78 kW (104 hp) per cylinder. [1] [2] The current top version of the M139 produces 350 kW (469 hp), giving it a specific output of 175 kW (235 hp) per litre or 87.5 kW (117 hp) per cylinder, maintaining its status as the most powerful four-cylinder engine in serial production.