Mercedes-Benz M111 engine
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.
|Mercedes-Benz M111 engine|
|Production||1992 to 2003|
|Displacement||1.8 L (1,799 cc)|
2.0 L (1,998 cc)
2.2 L (2,199 cc)
2.3 L (2,295 cc)
|Cylinder bore||89.9 mm (3.54 in)|
90.9 mm (3.58 in)
|Piston stroke||78.7 mm (3.10 in)|
86.6 mm (3.41 in)
88.4 mm (3.48 in)
|Block material||Cast iron|
|Head material||Aluminum alloy|
|Valvetrain||DOHC 4 valves x cyl.|
|Compression ratio||9.6:1, 10.0:1, 10.4:1, 10.6:1|
|Supercharger||In some versions|
|Fuel system||Fuel injection|
|Management||Siemens PEC/PMS (Pressure Engine Control)|
|Cooling system||Water cooled|
|Power output||90–145 kW (122–197 PS; 121–194 hp)|
|Torque output||170–280 N⋅m (125–207 lb⋅ft)|
The M111.920 is a 1.8 L (1,799 cc) 16 valve engine. It produces 90 kW (122 PS; 121 hp) of power at 5500 rpm and 170 N⋅m (125 lb⋅ft) at 4200 rpm. 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: 1996-2000 C180 W202.
- 1993-2000 C180 (W202)
The M111.940 is a 2.0 L (1,998 cc) 16-valve engine with bore and stroke of 89.9 mm × 78.7 mm (3.54 in × 3.10 in) and compression ratio of 9.6:1. It produces 100 kW (136 PS; 134 hp) of power and 190 N⋅m (140 lb⋅ft) of torque.
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 years following. It produces 100 kW (136 PS; 134 hp) of power and 190 N⋅m (140 lb⋅ft) of torque.
This motor, never had PMS. Early models -95 to -97 has HFM-motronic, hot-film type air/fuel metering device, and -97 to -2002 with ME2.1 motronic. The later system also has the magnet on the intake camshaft, and gives signal to ECU, and makes motor more torque at low revs. Early motor don't even have Camshaft position sensor, so wiring is much different.
Only problem with these M111 excellent reliability motor is original installed Victor Reinz Headgasket, which tearing apart by age, and wrong coolant, and loses coolant on the side. Other than that, only some years , had bad insulation on engine wiring, and needed all wiring replacement.
It produces 141 kW (192 PS; 189 hp) and 270 N⋅m (199 lb⋅ft).
- 1996-2000 SLK200 Kompressor (R170)
The M111.944 is a 2.0 L (1,998 cc) 16-valve engine utilizing a supercharger similar to the 2.3L M111.973 engine. It produces 141 kW (192 PS; 189 hp) of power and 270 N⋅m (199 lb⋅ft) of torque. This engine was built especially for SLK 170 and CLK 208 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.
It produces 100 kW (136 PS; 134 hp) and 190 N⋅m (140 lb⋅ft).
- 1996-2000 SLK200 (R170)
It produces 137 kW (186 PS; 184 hp) and 270 N⋅m (199 lb⋅ft).
- 1997-2002 E200Kompressor (W210)
EVO engine ((M 111 E 20 EVO). Naturally aspirated. compression ratio is 10.6:1, the power is 129 hp (96 kW; 131 PS), torque - 140 lb⋅ft (190 N⋅m). Improvement includes reinforced cylinder block, new cylinder head, individual coils and new sparkplugs, connecting rods and pistons for higher compression ratio, fuel injection improvements. 
- 2000-2002 Mercedes-Benz C Class (W 203) C180
It produces 120 kW (163 PS; 161 hp) of power.
- 2000-2002 Mercedes-Benz C Class (W 203) Kompressor
- 2001 Mercedes-Benz SportCoupe (CL203) Kompressor
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 (163 PS; 161 hp) and torque of 230 N⋅m (170 lb⋅ft) @ 2500 rpm.
- 2000-2002 E200K
It produces 120 kW (163 PS; 161 hp) and 230 N⋅m (170 lb⋅ft).
- 2000-2004 SLK200 Kompressor (R170)
M111.960 / M111.961Edit
The M111.960 is a 2.2 L (2,199 cc) 16-valve engine with bore and stroke of 89.9 mm × 86.6 mm (3.54 in × 3.41 in) and compression ratio of 10:1. It produces 110 kW (150 PS; 148 hp) of power and 210 N⋅m (155 lb⋅ft) of torque.
- 1992-1995 E220
- 1994 - 1996 Mercedes-Benz W202 C220
M111.970 and M111.974Edit
The M111.970 is a 2.3 L (2,295 cc) 16-valve engine with bore and stroke of 90.9 mm × 88.4 mm (3.58 in × 3.48 in) and compression ratio of 10.4:1. It produces 110 kW (150 PS; 148 hp) of power and 220 N⋅m (162 lb⋅ft) of torque.
It produces 142 kW (193 PS; 190 hp) and 280 N⋅m (207 lb⋅ft).
- 1996-2000 SLK230 Kompressor (R170)
Similar to the 2.3L M111.970 engine, except the usage of a supercharger (kompressor), boosting its power output to 142 kW (193 PS; 190 hp).
- 1999 E200 Kompressor
- 1997-2002 CLK230 Kompressor (C208)
- 1999-2002 C230 Kompressor (W202)
- 1998-2004 SLK230 Kompressor
Note: For the W210 E200 Kompressor from 1997 to 1999 the power output is 186 hp (139 kW; 189 PS).
Only the 1999 W210 E200 Kompressor received the 193 hp (144 kW; 196 PS).
Similar to the 2.3L M111.974 engine.
Power 143 kW (194 PS; 192 hp).
- 2002 C230 Kompressor
It produces 145 kW (197 PS; 194 hp) and 280 N⋅m (207 lb⋅ft).
- 2000-2004 SLK230 Kompressor (R170)
Power 105 kW (143 PS; 141 hp).
- Mercedes Benz E-Class - from Mercedes Club.cz (Czech Republic)