| Mercedes-Benz M273 | |
| Manufacturer: | Mercedes-Benz |
| Production: | 2005–2013 |
| Configuration: | Naturally aspirated 90° V8 |
| Valvetrain: | DOHC 4 valves x cyl. and continuous VVT |
| Predecessor: | Mercedes-Benz M113 |
| Successor: | Mercedes-Benz M278 |
| Fueltype: | Gasoline |
| Fuelsystem: | Sequential port injection |
| Coolingsystem: | Water cooled |
| Block: | Aluminium |
| Head: | Aluminium |
| Displacement: | 4663cc 5461cc |
| Bore: | 92.9mm 98mm |
| Stroke: | 86mm 90.5mm |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
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.
The E47 is a 4663cc version. Bore and stroke is NaNmm. Output is 2500NaN0 at 6000 rpm with 4600NaN0 of torque at 2700–5000 rpm.
Applications:
The E55 is a 5461cc version. Bore and stroke increased to NaNmm. Output is 2850NaN0 at 6000 rpm with 5300NaN0 of torque at 2800–4800 rpm.
Applications:
*Note: 500 or 550 model naming varies depending on geographical market.