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.
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M111.920
The M111.920 is a 1.8 L (1799 cc) 16 valve engine. It produces 90 kW (122 hp) of power at 5500 rpm, and 170 Nm 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: 1997-2000 C180 W202.
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M111.940
The M111.940 is a 2.0 L (1998 cc) 16-valve engine with bore and stroke of 89.9 x 78.7 mm and compression ratio of 9.6:1. It produces 100 kW (136 hp) of power and 190 Nm of torque.
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Unlike the 102, 103, and early 104 series engines, the engine did not use mechanical 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.
M111.942
Similar to the M111.940 engine, used in the years following. It produces 100 kW (134 hp, 136PS) of power and 190 Nm (140 lb·ft) of torque.
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M111.943
The M111.943 is a 2.0 L (1998 cc) 16-valve engine utilizing a supercharger similar to the 2.3L M111.973 engine. It produces 141 kW (192 hp) of power and 270 Nm of torque. This engine was built especially for SLK 170 and CLK 208 exported to Italy, 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.
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M111.946
It produces 100 kW (136 hp) of power.
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M111.955
It produces 120 kW (153 hp) of power.
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M111.957
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 (161 hp, 163PS) and torque of 230 Nm (170 lb·ft) @ 2500 rpm.
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M111.960 / M111.961
The M111.960 is a 2.2 L (2199 cc) 16-valve engine with bore and stroke of 89.9 x 86.6 mm and compression ratio of 10:1. It produces 110 kW (150 hp) of power and 210 Nm of torque.
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M111.970 and M111.974
The M111.970 is a 2.3 L (2295 cc) 16-valve engine with bore and stroke of 90.9 x 88.4 mm and compression ratio of 10.4:1. It produces 110 kW (150 hp) of power and 220 Nm of torque.
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M111.974
Similar to the 2.3L M111.970 engine, except the usage of a supercharger (kompressor), boosting its power output to 142 kW (193 hp).
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M111.973
Similar to the 2.3L M111.974 engine.
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M111.984
Power 105 kW (143 PS; 141 hp).
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