Mercedes-Benz M273 engine

Mercedes-Benz M273
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.

E47

The E47 is a 4.7 L (4,663 cc) version. Bore and stroke is 92.9 mm × 86 mm (3.66 in × 3.39 in). Output is 250 kW (340 PS; 335 hp) at 6000 rpm with 460 N⋅m (339 lb⋅ft) of torque at 2700–5000 rpm.

Applications:

2007–2012 GL 450 (X164)
2007–2013 S 450 (W221)

E55

The E55 is a 5.5 L (5,461 cc) version. Bore and stroke increased to 98 mm × 90.5 mm (3.86 in × 3.56 in). Output is 285 kW (387 PS; 382 hp) at 6000 rpm with 530 N⋅m (391 lb⋅ft) of torque at 2800–4800 rpm.

Applications: