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.

All are built in Bad Cannstatt, Germany except the supercharged C32 AMG, which is 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 version. Bore and stroke is . The engine produces between 5500 and 6000 rpm and of torque between 3000 and 5500 rpm. The compression ratio is 10.0:1.

Applications:

* 1996–2000 W202 C 240
* 1998–2000 W210 E 240

E26

The E26 is a version. Bore and stroke is . Output is ECE at 5,500 rpm of torque at 4,500 rpm in all applications except in the 2003-2005 W211 E-Class where power rose to . The compression ratio is raised to 10.5:1.

Applications:
* 2000–2005 W203 C 240
* 2000–2002 W210 E 240
* 2003–2005 W211 E 240
* 2002–2005 C209 CLK 240

E28

The E28 is a version. Bore and stroke is . It produces ( W220 S280 and W210 E280) or ( W202 C280) at 5,700 rpm and of torque between 3,000 and 5,000 rpm. The compression ratio is 10.0:1.

Applications:
* 1998–2000 W202 C 280
* 1998–2006 W220 S 280
* 1998–2002 W210 E 280

E32

The E32 is a version. Bore remains at but the engine is stroked to . Output is 215-224 bhp ECE at 5,700 rpm (depending on model) with of torque at 3,000-4,800 rpm. The compression ratio is 10.0:1. It has fracture-split forged steel connecting rods.

Applications:
* 2000–2005 C 320
* 1998–2005 E 320
* 1997–2006 G 320
* 1998–2002 S 320
* 1998–2003 ML 320
* 2000–2003 SLK 320
* 1998–2005 CLK 320
* 2003–2015 Viano 3.0/Vito 119 (W639)
* 2004–2008 Chrysler Crossfire

E 32 ML

The E 32 ML is a special version of the , 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 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 ECE at 6,100 rpm with of torque at 3,000-4,600 rpm. The compression ratio is 9.0:1.

Applications:
* 2001–2003 C 32 AMG
* 2001–2003 SLK 32 AMG
* 2002 A 32K AMG
* 2005–2006 Chrysler Crossfire SRT-6

E37

The E37 is a version. It retains the stroke of the E32 but is bored to . Output is ECE at 5,750 rpm with of torque at 3,000-4,500 rpm. The compression ratio is 10.0:1.

Applications:
* 2003–2005 ML 350
* 2003–2006 S 350
* 2003–2006 SL 350
* 2004–2008 V 350

See also

* List of Mercedes-Benz engines

References

{{Reflist

M112
V6 engines
Gasoline engines by model