Mercedes-Benz M112 engine

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 1998, it was the first V6 engine ever built by Mercedes. A short time later the related M113 V8 was introduced.

Mercedes-Benz M112 engine
M112 motor in a 2002 C240, 2.6L
Overview
Manufacturer	Mercedes-Benz
Production	1998-2015
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)
Block material	Aluminum
Head material	Aluminum
Valvetrain	SOHC 3 valves x cyl.
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	first Mercedes-Benz V6 engine; last straight-six engine is the Mercedes-Benz M104
Successor	Mercedes-Benz M272

All are built in Bad Cannstatt, Germany except the supercharged AMG C32 AMG, which is assembled in Affalterbach, Germany.

All M112 engines have aluminum engine blocks with a 90° vee angle with silicon/aluminum lined cylinders. 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.

E24

The E24 is a 2.4 L (2,398 cc) version. Bore and stroke is 83.2 mm × 73.5 mm (3.28 in × 2.89 in). The engine produces 168 bhp (125 kW; 170 PS) between 5500 and 6000 rpm and 225 N⋅m (166 lb⋅ft) of torque between 3000 and 5500 rpm. The compression ratio is 10.0:1.[1]

Applications:

• 1997-2000 C240
• 1998-2000 CLK240
• 1998-2000 E240

E26

The E26 is a 2.6 L (2,597 cc) version. Bore and stroke is 89.9 mm × 68.2 mm (3.54 in × 2.69 in). Output is 125 kW (170 PS; 168 bhp) ECE at 5,500 rpm 240 N⋅m (177 lb⋅ft) of torque at 4,500 rpm in all applications except in the 2003-2005 W211 E-Class where power rose to 130 kW (177 PS; 174 bhp). The compression ratio is raised to 10.5:1.[1]

Applications:

• 2000–2005 C240
• 2000–2004 E240
• 2002–2005 CLK240

E28

The E28 is a 2.8 L (2,799 cc) version. Bore and stroke is 89.9 mm × 73.5 mm (3.54 in × 2.89 in). It produces 204 bhp (152 kW; 207 PS) at 5,700 rpm and 270 N⋅m (199 lb⋅ft) of torque between 3,000 and 5,000 rpm. The compression ratio is 10.0:1.[1]

Applications:

• 1998–2000 C280
• 1998–2006 S280
• 1998–2004 E280

E32

The E32 is a 3.2 L (3,199 cc) version. Bore remains at 89.9 mm (3.54 in) but the engine is stroked to 84 mm (3.31 in). Output is 215-224 bhp ECE at 5,700 rpm (depending on model) with 315 N⋅m (232 lb⋅ft) of torque at 3,000-4,800 rpm. The compression ratio is 10.0:1. It has fracture-split forged steel connecting rods.[1]

Applications:

• 2000–2004 C320
• 1998–2005 E320
• 1997-2006 G320
• 1998–2005 S320
• 1998–2003 ML320
• 2000–2003 SLK320
• 1998–2005 CLK320
• 2010–2015 Viano 3.0/Vito 119 (W639)
• 2004-2008 Chrysler Crossfire

E 32 ML

Supercharged Mercedes-AMG C32/SLK32 engine

The E 32 ML is a special version of the 3.2 L (3,199 cc), fitted with a helical Twin-screw type supercharger and water-to-air intercooler. The supercharger was developed in conjunction with IHI and features Teflon-coated rotors producing overall boost of 14.5 psi (1.00 bar). Output is 260 kW (354 PS; 349 bhp) ECE at 6,100 rpm with 450 N⋅m (332 lb⋅ft) of torque at 3,000-4,600 rpm. The compression ratio is 9.0:1.[1]

Applications:

• 2001–2003 C32 AMG
• 2001–2003 SLK32 AMG
• 2005-2006 SRT-6

E37

The E37 is a 3.7 L (3,724 cc) version. It retains the stroke of the E32 but is bored to 97 mm (3.82 in). Output is 173 to 180 kW (235 to 245 PS; 232 to 241 bhp) ECE at 5,750 rpm with 344 N⋅m (254 lb⋅ft) of torque at 3,000-4,500 rpm. The compression ratio is 10.0:1.[1]

Applications:

• 2003–2005 ML350
• 2003–2006 S350
• 2003-2006 SL350
• 2004-2008 V350

See also

• List of Mercedes-Benz engines

References

1. "Mercedes-Benz M112 V6 petrol engine". motor-car.net. Retrieved 8 January 2020.