| Mercedes-Benz M273 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 2005–2013 |
| Layout | |
| Configuration | Naturally aspirated 90° V8 |
| Displacement | 4.7 L (4,663 cc) 5.5 L (5,461 cc) |
| Cylinder bore | 92.9 mm (3.66 in) 98 mm (3.86 in) |
| Piston stroke | 86 mm (3.39 in) 90.5 mm (3.56 in) |
| Cylinder block material | Aluminium |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC 4 valves x cyl. and continuous VVT |
| Combustion | |
| Fuel system | Sequential port injection |
| Fuel type | Gasoline |
| Cooling system | Water cooled |
| Output | |
| Power output | 250–285 kW (340–387 PS; 335–382 hp) |
| Torque output | 460–530 N⋅m (339–391 lb⋅ft) |
| Chronology | |
| Predecessor | Mercedes-Benz M113 |
| Successor | Mercedes-Benz M278 |
The Mercedes-Benz M273 engine is a V8 automobile piston engine family used in the 2000s (decade). It was based on the similar M272 V6 introduced in 2004.
An evolution of the M113 V8,[1] all M273s have aluminium engine blocks, sequential port fuel injection, fracture-split forged steel connecting rods, a one-piece cast crankshaft, and a magnesium intake manifold. The cylinders are lined with silicon/aluminium, and a dual-length variable-length intake manifold is fitted.[2]
In addition to this, new features shared with the M272 include DOHC aluminium cylinder heads, 4 valves per cylinder and independent continuously variable valve timing on both the intake and exhaust sides. A new electronically controlled cooling system has eliminated the need for a mechanical thermostat for improved engine warm-up and optimum control of engine temperature.
- ^ "Mercedes-Benz M273 engine". australiancar.reviews. Retrieved 2018-06-17.
- ^ "M273 5.5/4.7L Engine - In-Depth Look at Design and Reliability".