Mercedes-Benz M112 engine

Mercedes-Benz M112 engine
Overview
Manufacturer	Mercedes-Benz
Production	1996–2015
Layout
Configuration	90° V6
Displacement	2.4 L (2,398 cc) 2.6 L (2,597 cc) 2.8 L (2,799 cc) 3.2 L (3,199 cc) 3.7 L (3,724 cc)
Cylinder bore	83.2 mm (3.28 in) 89.9 mm (3.54 in) 97 mm (3.82 in)
Piston stroke	68.2 mm (2.69 in) 73.5 mm (2.89 in) 84 mm (3.31 in)
Cylinder block material	Aluminum
Cylinder head material	Aluminum
Valvetrain	SOHC 3 valves x cyl.
RPM range
Max. engine speed	6,000-6,400 rpm
Combustion
Supercharger	IHI Twin-screw type (in some versions)
Fuel system	Sequential fuel injection
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	125–260 kW (170–354 PS; 168–349 bhp)
Torque output	225–450 N⋅m (166–332 lb⋅ft)
Chronology
Predecessor	Mercedes-Benz M104 (inline-6)
Successor	Mercedes-Benz M272

The Mercedes-Benz M112 engine is a gasoline-fueled, 4-stroke, spark-ignition, internal-combustion automobile piston V6 engine family used in the 2000s. Introduced in 1996, it was the first gasoline V6 engine ever built by Mercedes. A short time later the related M113 V8 was introduced.

All are built in Bad Cannstatt, Germany, except the supercharged C 32 AMG and SLK 32 AMG, assembled in Affalterbach, Germany.

All M112 engines have silicon/aluminum (Alusil) engine blocks with a 90° vee angle. The aluminum SOHC cylinder heads have 3 valves per cylinder. All use sequential fuel injection with two spark plugs per cylinder. All have forged steel connecting rods, a one-piece cast camshaft, iron-coated aluminum pistons and a magnesium intake manifold. To deal with the vibration problems of a 90 degree V6, a balancer shaft was installed in the engine block between the cylinder banks. This essentially eliminated first and second order vibration problems (see engine balance). A dual-length Variable Length Intake Manifold is fitted to optimise engine flexibility.