Mercedes-Benz M112 engine explained

Mercedes-Benz M112 engine
Manufacturer:Mercedes-Benz
Production:1996–2015
Configuration:90° V6
Block:Aluminum
Head:Aluminum
Valvetrain:SOHC 3 valves x cyl.
Fueltype:Gasoline
Fuelsystem:Sequential fuel injection
Coolingsystem:Water cooled
Redline:6,000-6,400 rpm
Supercharger:IHI Twin-screw type (in some versions)
Displacement:2398cc
2597cc
2799cc
3199cc
3724cc
Bore:83.2mm
89.9mm
97mm
Stroke:68.2mm
73.5mm
84mm
Power:NaN0NaN0
Torque:NaN0NaN0
Predecessor:Mercedes-Benz M104 (inline-6)
Successor:Mercedes-Benz M272

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 2398cc version. Bore and stroke is NaNmm. The engine produces 1680NaN0 at 5900 rpm and 2250NaN0 of torque between 3000 and 5500 rpm. The compression ratio is 10.0:1.[1] [2]

Applications:

E26

The E26 is a 2597cc version. Bore and stroke is NaNmm. Output is 1250NaN0 ECE at 5,500 rpm 2400NaN0 of torque at 4,500 rpm in all applications except in the 2003-2005 W211 E-Class where power rose to 1300NaN0.[3] [4] [5] The compression ratio is raised to 10.5:1.[6]

Applications:

M112.912:

M112.914:

M112.916:

M112.917:

M112.950:

E28

The E28 is a 2799cc version. Bore and stroke is NaNmm. It produces 2010NaN0 (W220 S280, R129 SL280 and W210 E280) or 1940NaN0 (W202 C280) at 5,700 rpm and 2700NaN0 of torque between 3,000 and 5,000 rpm. The compression ratio is 10.0:1.[7]

Applications:

E32

The E32 is a 3199cc version. Bore remains at 89.9mm but the engine is stroked to 84mm. Output is 215-224 bhp ECE at 5,700 rpm (depending on model) with 3150NaN0 of torque at 3,000-4,800 rpm. The compression ratio is 10.0:1. It has fracture-split forged steel connecting rods.[8]

Applications:

E32 ML

The E32 Kompressor is a special version of the 3199cc, 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 14.5psi 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 2600NaN0 ECE at 6,100 rpm with 4500NaN0 of torque at 3,000-4,600 rpm. The compression ratio is 9.0:1.[9]

Applications:

E37

The E37 is a 3724cc version. It retains the stroke of the E32 but is bored to 97mm. Output is 173to ECE at 5,750 rpm with 3440NaN0 of torque at 3,000-4,500 rpm. The compression ratio is 10.0:1.[10]

Applications:

See also

Notes and References

  1. Web site: Mercedes-Benz M112 V6 petrol engine. motor-car.net. 8 January 2020 . https://web.archive.org/web/20200929224712/https://motor-car.net/mercedes-engines/item/20013-mercedes-m112 . 29 September 2020.
  2. Web site: C 240 / W 202 E 24, 1997 - 2000. 28 November 2023. mercedes-benz-publicarchive.com.
  3. Web site: Detailed specs review of 2004 Mercedes-Benz E 240 model for Europe . 2023-02-18 . www.automobile-catalog.com.
  4. Web site: 2002-2005 Mercedes E 240 W211 Specs & Performance, Ranks & Comparisons . 2023-02-18 . encyCARpedia . en-GB.
  5. Web site: Mercedes Benz E Class (W211) 240 4Matic Technical Specs, Fuel Consumption, Dimensions . 2023-02-18 . www.ultimatespecs.com.
  6. Web site: C 240 / W 203 E 26, 2000 - 2004. 28 November 2023. mercedes-benz-publicarchive.com.
  7. Web site: C 280 (V6 engine) / W 202 E 28, 1997 - 2000. 28 November 2023. mercedes-benz-publicarchive.com.
  8. Web site: CLK 320 / C 208 E 32, 1997 - 1999. 28 November 2023. mercedes-benz-publicarchive.com.
  9. Web site: SLK 32 AMG / R 170 E 32 ML, 2001 - 2004. 28 November 2023. mercedes-benz-publicarchive.com.
  10. Web site: ML 350 / W 163 E 37, 2002 - 2004. 28 November 2023. mercedes-benz-publicarchive.com.