| Mercedes-Benz M111 engine | |
| Manufacturer: | Mercedes-Benz |
| Production: | 1992–2003 |
| Configuration: | Straight-4 |
| Valvetrain: | DOHC 4 valves x cyl. |
| Block: | Cast iron |
| Head: | Aluminum alloy |
| Displacement: | 1799cc 1998cc 2199cc 2295cc |
| Bore: | 85.3mm 89.9mm 90.9mm |
| Stroke: | 78.7mm 86.6mm 88.4mm |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
| Predecessor: | Mercedes-Benz M102 engine |
| Successor: | Mercedes-Benz M271 engine |
| Compression: | 9.6:1, 10.0:1, 10.4:1, 10.6:1 |
| Fueltype: | Gasoline |
| Fuelsystem: | Fuel injection |
| Coolingsystem: | Water cooled |
| Management: | Siemens PEC/PMS (Pressure Engine Control) (1994-1996 W202 C180 C200, W124 E200) Bosch HFM (Hot Film Management) (1994-1996 W202 C220, W124 E220, 1996-2000 all 4cyl petrol W202, W210 |
| Supercharger: | In some versions |
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.
The M111.920[1] is a 1799cc 16 valve engine with bore and stroke of 85.3 mm × 78.7 mm. It produces 900NaN0 of power at 5500 rpm and 1700NaN0 at 4200 rpm. Starting with 1996 it has a variant called the M111.921[2] which has a MAF (Mass Air Flow)-sensor instead of MAP-sensor on the first one, and using ECU instead of PMS.
Applications:
The M111.940[3] is a 1998cc 16-valve engine with bore and stroke of NaNmm and compression ratio of 9.6:1. It produces 1000NaN0 of power and 1900NaN0 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.
Similar to the M111.940 engine, used in the following years. It produces 1000NaN0 of power and 1900NaN0 of torque.[4]
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.
The power is 950NaN0, torque 1800NaN0 at 4200 rpm. Later model had 1860NaN0 of torque at 3600-4500 rpm.[5]
Applications:
EVO engine (M 111 E 20 EVO).[6] Naturally aspirated, compression ratio is 10.6:1. The power is 950NaN0 at 5300 rpm, torque - 1900NaN0 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.[7]
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.[8]
Applications:
The M111.943 and M111.944 are a 1998cc 16-valve engines utilizing a supercharger similar to the 2.3L M111.973 engine. It produces 1410NaN0 of power and 2700NaN0 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 1320NaN0.[9]
Applications:
M111.943:
M111.944:
M111.947:
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 1200NaN0 and torque of 2300NaN0 @ 2500 rpm. EVO engine replacemed the Eaton M62 supercharger with Eaton M45 unit.[7] This engine was built for export to Italy, The Netherlands, Portugal and Greece for tax reasons.[10]
Applications:
M111.955:
M111.956:
M111.957:
M111.958:
The M111.960 is a 2199cc 16-valve engine with bore and stroke of NaNmm and compression ratio of 10:1. It produces 1100NaN0 of power and 2100NaN0 of torque.[11]
Applications:
The M111.970[12] is a 2295cc 16-valve engine with bore and stroke of NaNmm and compression ratio of 10.4:1. It produces 1100NaN0 or 90 kW (122 PS; 120 hp) of power and 2200NaN0 or 180 N·m (132 lb·ft) of torque.
Applications:
The M111.979 is a 2295cc 16-valve engine with bore and stroke of NaNmm and compression ratio of 8.8:1. It produces 1050NaN0 @5000 rpm and a maximum torque of 2100NaN0 @4000 rpm.
Applications:
M111.979:
M111.980:
M111.984:
The M111.977 is a 2295cc engine with compression ratio of 10.4:1. It produces 1100NaN0 and a maximum torque of 2200NaN0.[13]
Applications:
Similar to the 2.3L M111.970 engine, except the usage of a supercharger (kompressor), boosting its power output to 1420NaN0and 2800NaN0 of torque.[14]
Applications:
M111.973:
M111.975:
Similar to the 2.3L M111.974 engine, except supercharged. M 111 E 23 ML EVO. Power 1450NaN0.[15]
Applications: