The M111 engine family is a straight-4 automobile engine from Mercedes-Benz, produced from 1992 to 2003. Debuted in the 1992 Mercedes-Benz E-Class (W124), 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 1799 cc 16 valve engine with bore and stroke of 85.3 mm × 78.7 mm. It produces 90 kW of power at 5500 rpm and 170 Nm at 4200 rpm. Starting with 1996 it has a variant called the M111.921 which has a MAF (Mass Air Flow)-sensor instead of MAP-sensor on the first one, and using ECU instead of PMS. Applications:

E20

M111.940

The M111.940 is a 1998 cc 16-valve engine with bore and stroke of 89.9x78.7 mm and compression ratio of 9.6:1. It produces 100 kW of power and 190 Nm 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 (Pressure Engine Control) 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 (MAP). Injectors work in pairs (idle, part load), or altogether (full-load). It uses 2 ignition coils and no ignition distributor. Cylinders are fired in pairs (dual fire) - 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 100 kW of power and 190 Nm 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 95 kW, torque 180 Nm at 4200 rpm. Later model had 186 Nm of torque at 3600-4500 rpm. Applications:

M111.951 / M111.952

EVO engine (M 111 E 20 EVO). Naturally aspirated, compression ratio is 10.6:1. The power is 95 kW at 5300 rpm, torque - 190 Nm 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 (estate version) 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 1998 cc 16-valve engines utilizing a supercharger similar to the 2.3L M111.973 engine. It produces 141 kW of power and 270 Nm 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 132 kW. 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 120 kW and torque of 230 Nm @ 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 2199 cc 16-valve engine with bore and stroke of 89.9x86.6 mm and compression ratio of 10:1. It produces 110 kW of power and 210 Nm of torque. Applications:

E23

M111.970 / M111.974 / M111.978

The M111.970 is a 2295 cc 16-valve engine with bore and stroke of 90.9x88.4 mm and compression ratio of 10.4:1. It produces 110 kW or 90 kW (122 PS; 120 hp) of power and 220 Nm or 180 N·m (132 lb·ft) of torque. Applications:

M111.979 / M111.980 / M111.984

The M111.979 is a 2295 cc 16-valve engine with bore and stroke of 90.9x88.4 mm and compression ratio of 8.8:1. It produces 105 kW @5000 rpm and a maximum torque of 210 Nm @4000 rpm. Applications: M111.979: M111.980: M111.984:

M111.977

The M111.977 is a 2295 cc engine with compression ratio of 10.4:1. It produces 110 kW and a maximum torque of 220 Nm. Applications:

E23 ML

M111.973 / M111.975

Similar to the 2.3L M111.970 engine, except the usage of a supercharger (kompressor), boosting its power output to 142 kWand 280 Nm 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 145 kW. Applications: