Mercedes-Benz M272 engine

Mercedes-Benz M272
Overview
Manufacturer	Mercedes-Benz
Production	2004–2017
Layout
Configuration	Naturally aspirated 90° V6
Displacement	2.5 L (2,496 cc) 3.0 L (2,996 cc) 3.5 L (3,498 cc)
Cylinder bore	88 mm (3.46 in) 92.9 mm (3.66 in)
Piston stroke	68.4 mm (2.69 in) 82 mm (3.23 in) 86 mm (3.39 in)
Cylinder block material	Aluminum
Cylinder head material	Aluminum
Valvetrain	DOHC 4 valves x cyl. with continuous VVT
Combustion
Fuel system	port injection or direct injection (CGI)
Fuel type	Gasoline or E85 (M272 929)
Cooling system	Water cooled
Output
Power output	204–316 PS (150–232 kW; 201–312 bhp)
Torque output	245–365 N⋅m (181–269 lb⋅ft)
Chronology
Predecessor	Mercedes-Benz M112
Successor	Mercedes-Benz M276

The Mercedes-Benz M272 engine is an automobile piston V6 engine family used in the 2000s (decade). Introduced in 2004, it is based on the M112 V6 introduced in 1998.

All M272 engines have aluminum engine blocks with a 90° V-angle with silicon/aluminum lined cylinders. The aluminum DOHC cylinder heads have 4 valves per cylinder. All have forged steel connecting rods, one-piece cast crankshaft, iron-coated aluminum pistons and a magnesium intake manifold. Like the M112, a balance shaft is installed in the engine block between the cylinder banks to deal with vibrations in the 90 degree V6 design. This essentially eliminates first and second order moments. A dual-length Variable Length Intake Manifold is fitted to optimize engine flexibility.

Continuous VVT was adopted for the first time. Featured on both the intake and exhaust camshafts, each can be varied through a range of 40 degrees. The twin spark plug system was replaced by a regular single spark plug per cylinder. New electronic coolant flow control has replaced the mechanical thermostat for improved engine warm-up and optimum control of engine temperature. Also tumble flaps are used to improve output at low engine speeds.