Mercedes-Benz M256 engine
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3.0 L (2,999 cc)
| Mercedes-Benz M256 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 2017–present |
| Layout | |
| Configuration | Straight-six |
| Displacement | 2.5 L (2,498 cc) 3.0 L (2,999 cc) |
| Cylinder bore | 83 mm (3.27 in) |
| Piston stroke | 77 mm (3.03 in) 92.4 mm (3.64 in) |
| Cylinder block material | Aluminium alloy |
| Cylinder head material | Aluminium alloy |
| Valvetrain | DOHC 4 valves x cyl |
| Compression ratio | 10.5:1 |
| Combustion | |
| Supercharger | BorgWarner eBooster |
| Turbocharger | Single-turbo twin-scroll |
| Fuel system | Direct injection |
| Fuel type | Petrol |
| Oil system | Dry sump. Oil supplied by Petronas |
| Cooling system | Water cooled |
| Output | |
| Power output | 230–320 kW (313–435 PS) |
| Torque output | 450–520 N⋅m (332–384 lb⋅ft) |
| Chronology | |
| Predecessor | Mercedes-Benz M276 |
The Mercedes-Benz M256 engine is a turbocharged straight-six engine produced since 2017, when it was first introduced on the W222 S 450.[1] It replaces the previous M276 V6 engine,[2] and is Mercedes' first petrol-powered straight-six engine since the M104 engine.[3]
The M256 shares a modular design with other inline-four and V8 engines, which are all 500 cc (31 cu in) per cylinder.[4] It uses an aluminium alloy block with dual overhead camshafts and has 4 valves per cylinder.[5] The M256 uses a 48V electrical system to operate a BorgWarner electric supercharger,[6] which can spin up to 70,000 rpm to reduce turbo lag.[7] In the S 500's G variant engine, an integrated starter alternator also provides up to 16 kW (22 PS) and 250 N⋅m (184 lb⋅ft) of boost, and replaces the drive belts by managing the water pump and air conditioning; allowing for a smaller and lighter engine.[8]
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