Mercedes-Benz OM656 engine
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Production2017–present
Displacement2.9 L (2,927.8 cc), 3.0 L (2,989.8 cc)
| Mercedes-Benz OM656 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 2017–present |
| Layout | |
| Configuration | Straight-six engine |
| Displacement | 2.9 L (2,927.8 cc), 3.0 L (2,989.8 cc) |
| Cylinder bore | 82 mm (3.23 in) |
| Piston stroke | 92.4 mm (3.64 in) |
| Cylinder block material | Aluminium alloy |
| Cylinder head material | Aluminium alloy |
| Valvetrain | DOHC 4 valves x cyl. with VVL - CAMTRONIC |
| Compression ratio | 15.5:1 |
| Combustion | |
| Supercharger | BorgWarner eBooster electrically driven compressor |
| Turbocharger | BorgWarner R2S® Biturbo (only one twin-scroll) |
| Fuel system | Common rail direct injection |
| Fuel type | Diesel |
| Cooling system | Water cooled |
| Output | |
| Power output | 210–270 kW (282–362 hp) |
| Torque output | 600–750 N⋅m (443–553 lb⋅ft) |
| Chronology | |
| Predecessor | |
The OM656 is a turbocharged diesel engine produced by Mercedes-Benz since 2017. It was first introduced in the facelift W222 S-Class.[1]
The OM656 is based on a modular design that is shared with other 4-cylinder and 6-cylinder, petrol and diesel engines.[2] It is the replacement to the previous V6,[3] in order to maintain the cost of production between different engines. The OM656 has dual overhead camshafts with variable valve timing, and uses AdBlue injection and exhaust gas recirculation to reduce emissions.[4] The cylinder walls are coated with arc sprayed steel whose increased porosity aids oil film strength to reduce friction.[5][6]