Mercedes-Benz OM651 | |
---|---|
Overview | |
Manufacturer | Mercedes-Benz |
Production | 2008–present |
Layout | |
Configuration | Inline 4 [1] |
Displacement | 1.8 L (1,796 cc) 2.1 L (2,143 cc) |
Cylinder bore | 83 mm (3.27 in) |
Piston stroke | 83 mm (3.27 in) 99 mm (3.9 in) |
Cylinder block material | Cast iron [2] |
Cylinder head material | Aluminium alloy |
Valvetrain | DOHC, chain-driven |
Compression ratio | 16.2:1 |
Combustion | |
Turbocharger | Single turbo / twin-turbo |
Fuel system | Common rail |
Fuel type | Diesel |
Cooling system | Water cooled |
Output | |
Power output | 80–150 kW (107–201 hp) |
Chronology | |
Predecessor | Mercedes-Benz OM646 engine |
Successor | Mercedes-Benz OM654 engine |
The OM651 is a family of inline-four cylinder automobile diesel engines introduced by Mercedes-Benz in 2008.
The main goal was to create a common engine design that maximized the parts commonality across the engines manufactured by parent company, Daimler.
One requirement of the design was the ability of the engine to be mounted both longitudinally and transversely. Improved fuel efficiency and compliance with Euro 5 emission standards were also design objectives, by 2010 being updated to the Euro 6 standard; four piezo-electric injectors fed with very high pressure fuel from a common rail inject fuel directly into the combustion chambers to improve combustion compared to previous Mercedes Diesel engines and recirculated exhaust gas reduces the oxygen in the cylinders to "starve" any reactions that would produce NO(x).
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