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 2398 cc version. Bore and stroke is 83.2x73.5 mm. The engine produces 168 bhp at 5900 rpm and 225 Nm 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 2597 cc version. Bore and stroke is 89.9x68.2 mm. Output is 125 kW ECE at 5,500 rpm 240 Nm of torque at 4,500 rpm in all applications except in the 2003-2005 W211 E-Class where power rose to 130 kW. The compression ratio is raised to 10.5:1.

Applications:

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

E28
The E28 is a 2799 cc version. Bore and stroke is 89.9x73.5 mm. It produces 201 bhp (W220 S280, R129 SL280 and W210 E280) or 194 bhp (W202 C280) at 5,700 rpm and 270 Nm 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 3199 cc version. Bore remains at 89.9 mm but the engine is stroked to 84 mm. Output is 215-224 bhp ECE at 5,700 rpm (depending on model) with 315 Nm 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 3199 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 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 ECE at 6,100 rpm with 450 Nm 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 3724 cc version. It retains the stroke of the E32 but is bored to 97 mm. Output is 173 to 180 kW ECE at 5,750 rpm with 344 Nm 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