Naturally aspirated, compression ratio is 10.6:1. 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. This engine was built especially for SLK 170 and CLK 208 exported to Italy, The Netherlands, Portugal and Greece for tax reasons. 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. Other than that, only some year models, had bad insulation on the engine wiring, that needed all the wiring to be replaced. 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. The early motor didn't have any camshaft position sensor, so wiring was much different. 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. Early models -95 to -97 has a HFM-motronic, hot-film type air/fuel metering device, and -97 to -2002 with ME2.1 motronic. Similar to the M111.940 engine, used in the following years. Thus, the engine management has precise information which group of cylinders to fire, and which group of injectors to spray. 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. Cylinders are fired in pairs (dual fire) - 1 and 4 together, and 2 and 3 together. It uses 2 ignition coils and no ignition distributor. Injectors work in pairs (idle, part load), or altogether (full-load). It is a speed-density type of system, as mixture formation is dependent on RPM, TPS angle, and manifold pressure (MAP). 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. 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. All engines in the family use a cast iron engine block and aluminum alloy cylinder head. Debuted in the 1992 Mercedes-Benz E-Class ( W124), this engine family is relatively oversquare and uses 4 valves per cylinder. The M111 engine family is a straight-4 automobile engine from Mercedes-Benz, produced from 1992 to 2003. Reciprocating internal combustion engine Mercedes-Benz M111 engine
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