Mercedes-Benz Engine
OM648
The Mercedes-Benz OM648 is a I6 diesel piston engine.
- Years
- 2002–2006
- Configuration
- I6
- Fuel
- Diesel
- Top power
- 204 PS
A 3.2-liter straight six with 500 N·m — and only four years to use it.
The largest of the three engines Mercedes launched in 2002 on one shared architecture, it took over from the OM613 with the family's common 88 × 88.3 mm cylinder, cast-iron block, aluminum head, chain-driven twin camshafts and four valves apiece. Common-rail injection at 1,600 bar and a variable-nozzle turbocharger produced 204 PS at 4,200 rpm and 500 N·m held from 1,800 to 2,600 — enough, Mercedes claimed, to take a W211 E 320 CDI to 60 mph in 6.6 seconds while returning motorway economy no petrol six of the size could touch.
The applications were few and grand: the E 320 CDI, the W220 S 320 CDI, and from 2005 a de-rated 177-PS E 280 CDI below them. Then it was done. None of the OM646 EVO work reached the six, because from the summer of 2005 the new OM642 V6 began replacing both it and the five-cylinder OM647, packaging better and costing less to build in volume. Mercedes has since gone back to the straight six with the OM656, but the OM648 closed out the older line.
Versions.
Every factory version of the OM648.
| Version | Displacement | Bore × Stroke | Compression | Power | Torque |
|---|---|---|---|---|---|
| 648.960 | 3,222 cc | 88 × 88.3 mm | 18.0:1 | 150 kW (201 hp; 204 PS) at 4,200 rpm | 500 N·m (369 lb·ft) at 1,800 rpm |
| 648.961 (DE 32 LA red. (E 280 CDI)) | 3,222 cc | 88 × 88.3 mm | 18.0:1 | 130 kW (174 hp; 177 PS) at 4,200 rpm | 425 N·m (313 lb·ft) at 1,800 rpm |
| 648.961 (DE 32 LA (E 320 CDI)) | 3,222 cc | 88 × 88.3 mm | 18.0:1 | 150 kW (201 hp; 204 PS) at 4,200 rpm | 500 N·m (369 lb·ft) at 1,800 rpm |