# 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 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.

## 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) at 5900 rpm and 225 N⋅m (166 lb⋅ft) of torque between 3000 and 5500 rpm. The compression ratio is 10.0:1.
Applications:
* M112.910: 1996–2000 C 240 (W202)
* M112.911: 1996–2000 E 240 (W210)

## 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.
Applications:
M112.912:
* 1999–2005 C 240 (W203)
* 2001–2005 CLK 240 (C209)
M112.914:
* 1999–2002 E 240 (W210)
M112.916:
* 2002–2005 C 240 4MATIC (W203)
M112.917:
* 2001–2005 E 240 (W211)
M112.950:
* 2000–2001 C 240 (S202)

## 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 201 bhp (150 kW; 204 PS) (W220 S280, R129 SL280 and W210 E280) or 194 bhp (145 kW; 197 PS) (W202 C280) 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.
Applications:
* M112.920: 1996–2000 C 280 (W202)
* M112.921: 1996–2002 E 280 (W210)
* M112.922: 1997–2005 S 280 (W220)
* M112.923: 1997–2001 SL 280 (R129)

## 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.
Applications:
* M112.940: 1996–2002 CLK 320 (C208)
* M112.941: 1998–2003 E 320 (W210)
* M112.942: 1998–2003 ML 320 (W163)
* M112.943: 1998–2001 SL 320 (R129)
* M112.944: 1998–2002 S 320 (W220)
* M112.945: 1997–2006 G 320 (W463)
* M112.946: 2000–2005 C 320 (W203) & C 320 SportCoupé (CL203)
* M112.947: 2000–2003 SLK 320 (R170)
* M112.949: 2002–2005 E 320 (W211)
* M112.951: 2003–2015 Viano 3.0/Vito 119 (W639)
* M112.953: 2002–2005 C 320 4MATIC (W203)
* M112.954: 2003–2004 E 320 4MATIC (W211)
* M112.955: 2002–2005 CLK 320 (C209)
* 2004–2008 Chrysler Crossfire

## E32 ML

The E32 Kompressor is a special version of the 3.2 L (3,199 cc), fitted with a helical Twin-screw type supercharger. The supercharger was developed in conjunction with IHI and features Teflon-coated rotors producing overall boost of 14.5 psi (1.00 bar) with the factory 74mm clutch-activated pulley. A water-to-air intercooler made by Garrett is fitted beneath the supercharger inside the V, with a 0.8L Heat-Exchanger mounted under the bumper run by an electric water pump. 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.
Applications:
* M112.960: 2000–2004 SLK 32 AMG (R170)
* M112.961: 2000–2004 C 32 AMG (W203) & C 32 AMG SportCoupé (CL203)
* 2002 A 32K AMG
* 2005–2006 Chrysler Crossfire 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.
Applications:
* M112.970: 2001–2004 ML 350 (W163)
* M112.972: 2002–2005 S 350 (W220)
* M112.975: 2002–2005 S 350 4MATIC (W220)
* M112.973: 2001–2006 SL 350 (R230)
* 2004–2008 V 350