Mercedes-Benz M273 engine
| 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, 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.
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.