Mercedes-Benz M111 engine


The M111 engine family is a straight-four automobile engine from Mercedes-Benz, produced from 1992 to 2003. Debuted in the 1992 Mercedes-Benz E-Class, this engine family is relatively oversquare and uses 4 valves per cylinder. All engines in the family use a cast iron engine block and aluminum alloy cylinder head.

E18

M111.920 / M111.921

The M111.920 is a 16 valve engine with bore and stroke of 85.3 mm × 78.7 mm. It produces of power at 5500 rpm and at 4200 rpm. Starting with 1996 it has a variant called the M111.921 which has a MAF -sensor instead of MAP-sensor on the first one, and using ECU instead of PMS.
Applications:

E20

M111.940

The M111.940 is a 16-valve engine with bore and stroke of and compression ratio of 9.6:1. It produces of power and of torque.
Applications:
Unlike the 102, 103, and early 104 series engines, the engine did not use mechanical fuel injection but the Siemens PEC/PMS management system, which integrates fuel and spark management.
It is a speed-density type of system, as mixture formation is dependent on RPM, TPS angle, and manifold pressure.
Injectors work in pairs, or altogether.
It uses 2 ignition coils and no ignition distributor. Cylinders are fired in pairs - 1 and 4 together, and 2 and 3 together. The crankshaft position sensor is sensing the movement of two radially opposed position plates on the flywheel, one of which is magnetized, and the other is not. Thus, the engine management has precise information which group of cylinders to fire, and which group of injectors to spray.

M111.941 / M111.942 / M111.945 / M111.946

Similar to the M111.940 engine, used in the following years. It produces of power and of torque.
Applications:
M111.941:
M111.942:
M111.945:
M111.946:
This motor never had PMS. Early models -95 to -97 has a HFM-motronic, hot-film type air/fuel metering device, and -97 to -2002 with ME2.1 motronic. The later system also has a magnet on the intake camshaft, and gives signal to ECU, to assist the motor in producing more torque at low revs. The early motor didn't have any camshaft position sensor, so wiring was much different.
The only problem experienced with this M111 excellent reliability motor is the originally installed Victor Reinz headgasket, which eventually tore apart by age, and made the top lose coolant on the side. Other than that, only some year models, had bad insulation on the engine wiring, that needed all the wiring to be replaced.

M111.948 / M111.950

The power is, torque at 4200 rpm. Later model had of torque at 3600-4500 rpm.
Applications:

M111.951 / M111.952

EVO engine. Naturally aspirated, compression ratio is 10.6:1. The power is at 5300 rpm, torque - at 4000 rpm. Improvement includes reinforced cylinder block, new cylinder head, individual coil-on-plug ignition with new iridium-tipped spark plugs for 100,000km/60,000 mile replacement intervals, connecting rods and pistons for higher compression ratio, fuel injection now Siemens SIM4, EuroIV emissions compliant, dual oxygen sensors.
Applications:
A M111.952 variant of this engine was fitted to the final model year S202 where it replaced the older 1.8l 122hp version for MY 2001. 2295 built from 06.2000 until 1.2001.
Applications:

E20 ML

M111.943 / M111.944 / M111.947

The M111.943 and M111.944 are a 16-valve engines utilizing a supercharger similar to the 2.3L M111.973 engine. It produces of power and of torque. This engine was built especially to be exported to Italy, The Netherlands, Portugal and Greece for tax reasons. The 'executive cars' tax limit was based in engine's capacity bigger than 2000 cc, so Mercedes in order to hit these markets made a mixture of the M111.940 with the supercharger of M111.973 for high performance at low engine capacity. Early, 1995 iteration developed only.
Applications:
M111.943:
M111.944:
M111.947:

M111.955 / M111.956 / M111.957 / M111.958

M 111 E 20 ML EVO. This is a 2.0L Kompressor engine utilizing a supercharger similar to the 2.3L M111.974 engine, but with a lower power output of and torque of @ 2500 rpm. EVO engine replacemed the Eaton M62 supercharger with Eaton M45 unit. This engine was built for export to Italy, The Netherlands, Portugal and Greece for tax reasons.
Applications:
M111.955:
M111.956:
M111.957:
M111.958:

E22

M111.960 / M111.961

The M111.960 is a 16-valve engine with bore and stroke of and compression ratio of 10:1. It produces of power and of torque.
Applications:

E23

M111.970 / M111.974 / M111.978

The M111.970 is a 16-valve engine with bore and stroke of and compression ratio of 10.4:1. It produces or 90 kW of power and or 180 N·m of torque.
Applications:

M111.979 / M111.980 / M111.984

The M111.979 is a 16-valve engine with bore and stroke of and compression ratio of 8.8:1. It produces @5000 rpm and a maximum torque of @4000 rpm.
Applications:
M111.979:
M111.980:
M111.984:

M111.977

The M111.977 is a engine with compression ratio of 10.4:1. It produces and a maximum torque of.
Applications:

E23 ML

M111.973 / M111.975

Similar to the 2.3L M111.970 engine, except the usage of a supercharger, boosting its power output to and of torque.
Applications:
M111.973:
M111.975:

M111.981 / M111.982 / M111.983

Similar to the 2.3L M111.974 engine, except supercharged. M 111 E 23 ML EVO. Power.
Applications: