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 engine|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 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. A dual-length Variable Length [Intake Manifold] is fitted to optimise engine flexibility.
These engines, along with the V8 variant, are often regarded as being the most reliable Mercedes-Benz engines of their era.

E24

The E24 is a version. Bore and stroke is. The engine produces at 5900 rpm and of torque between 3000 and 5500 rpm. The compression ratio is 10.0:1.
Applications:
  • M112.910: 1996–2000 C 240
  • M112.911: 1996–2000 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:
M112.912:
M112.914:
M112.916:
M112.917:
M112.950:
The E28 is a version. Bore and stroke is. It produces |W220 S280], R129 SL280 and C 280
  • M112.921: 1996–2002 E 280
  • M112.922: 1997–2005 S 280
  • M112.923: 1997–2001 SL 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 with of torque at 3,000-4,800 rpm. The compression ratio is 10.0:1. It has fracture-split forged steel [connecting rods">Mercedes-Benz C-Class ">C 280
  • M112.921: 1996–2002 E 280
  • M112.922: 1997–2005 S 280
  • M112.923: 1997–2001 SL 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 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:
    The E32 Kompressor 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:
    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: