The OM656 is a turbocharged diesel engine produced by Mercedes-Benz since 2017. It was first introduced in the facelift W222 S-Class.[1]
Mercedes-Benz OM656 | |
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Overview | |
Manufacturer | Mercedes-Benz |
Production | 2017– |
Layout | |
Configuration | Straight six engine |
Displacement | 2.9 L (2,925 cc) |
Cylinder bore | 82 mm (3.23 in) |
Piston stroke | 92.4 mm (3.64 in) |
Block material | Aluminium alloy |
Head material | Aluminium alloy |
Valvetrain | DOHC 4 valves x cyl. with VVT |
Compression ratio | 15.5:1 |
Combustion | |
Supercharger | BorgWarner's eBooster® electrically driven compressor |
Turbocharger | Single-turbo |
Fuel system | Common rail Direct injection |
Fuel type | Diesel |
Cooling system | Water cooled |
Output | |
Power output | 210–250 kW (282–335 hp) |
Torque output | 600–700 N⋅m (443–516 lb⋅ft) |
Chronology | |
Predecessor | Mercedes-Benz OM642 |
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]
Engine | Power | Torque | Years |
---|---|---|---|
OM656 D29T R SCR | 210 kW (286 PS; 282 hp) at 3,400–4,600 rpm |
600 N⋅m (443 lb⋅ft) at 1,200–3,200 rpm |
2017–[7] |
OM656 D29T SCR | 250 kW (340 PS; 335 hp) at 3,600–4,400 rpm |
700 N⋅m (516 lb⋅ft) at 1,200–3,200 rpm |