Mercedes-Benz M112 engine
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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
|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)
|Valvetrain||SOHC 3 valves x cyl.|
|Supercharger||IHI Twin-screw type (in some versions)|
|Fuel system||Sequential fuel injection|
|Cooling system||Water cooled|
|Power output||125–260 kW (170–354 PS; 168–349 bhp)|
|Torque output||225–450 N⋅m (166–332 lb⋅ft)|
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.
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.
- 1997-2002 C240
- 1998-2002 CLK240
- 1998-2002 E240
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 5500 rpm with 240 N⋅m (177 lb⋅ft) of torque at 4500 rpm. The compression ratio is raised to 11.0:1.
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 5700 rpm and 270 N⋅m (199 lb⋅ft) of torque between 3000 and 5000 rpm. The compression ratio is 10.0:1.
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 160 to 165 kW (218 to 224 PS; 215 to 221 bhp) ECE at 5700 rpm with 315 N⋅m (232 lb⋅ft) of torque at 3000-4800 rpm. The compression ratio is 10.0:1. It has fracture-split forged steel connecting rods.
The C32 AMG is a special version of the 3.2 L (3,199 cc) C320, 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 6100 rpm with 450 N⋅m (332 lb⋅ft) of torque at 3000-4600 rpm. The compression ratio is 9.0:1.
The E37 is a 3.7 L (3,724 cc) version. It retains the stroke of the E320 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 5750 rpm with 344 N⋅m (254 lb⋅ft) of torque at 3000-4500 rpm. The compression ratio is 10.0:1.