The OM 660 is an in-line engine with three cylinders. The engine has a displacement of 799 cc (0.8 liters) and produces 45 horsepower (33 kW). The OM660 engine has an aluminum alloy cylinder block and head, two valves per cylinder, and a single overhead camshaft. It has an outlet gas recirculation system and is turbocharged.
A new Common Rail fuel system with higher boost pressure improved the Mercedes OM660’s performance in 2007. It was updated again in 2011 with additional performance and efficiency gains.
Specifications
| Also called | OM 660.950 |
| Engine’s type | diesel |
| Power output | 33 kW / 45 hp |
| Displacement | 799 cc |
| Number of cylinders | 3 |
| Number of valves | 6 |
| Manufacturer | Smart |
| Compression ratio | 18:1 |
| Cylinder bore | 65.5 mm |
| Piston stroke | 79 mm |
| Main bearings | 4 |
| Displacement | 14.8 cc |
| Power Index | 56 hp for 1 liter (1000 cc) |
OM 660.950 was installed on cars
- Smart FORTWO Cabrio
- Smart FORTWO coupe