The Mercedes-Benz M111 was an inline, four-cylinder petrol engine that was introduced in 1992 to replace the M102 engine. The M111 engine had a cast iron block, a lightweight alloy cylinder head, double overhead camshafts driven by double roller chains, four valves per cylinder actuated by bucket tappets and electronically-controlled fuel injection and ignition. Furthermore, most variants of the M111 engine had two-stage phase adjustment of the intake camshaft.
The M111 engine was initially available with an Eaton M62 Roots-type supercharger. Since the supercharger (or ‘Kompressor’) had no internal compression, it would be disconnected at partial loads so that it did not consume power; only at high loads would the supercharger operate to increase power and torque. With the introduction of the M111 EVO engine (detailed below), the Eaton M62 unit was replaced by the Eaton M45 supercharger.
Production of the M111 engine ended in 2006, having been superseded by the M271 engine in 2002.
M111 EVO
Released in 2000, the updated M111 EVO engine had over 150 different components relative to its predecessor. For the M111 EVO engine, changes included:
- Euro 4 emissions compliance;
- Siemens ME-SIM4 engine management;
- Fracture-split connecting rods;
- New Siemens injectors;
- Reinforcing crankcase ribs;
- As noted above, the Eaton M62 supercharger – for supercharged applications – was replaced by the Eaton M45 unit and the compressor clutch was eliminated;
- Improved cylinder charging;
- A fixed engine air filter;
- Adaptive idle control;
- A new intake tract;
- A new oil level sensor for the ASSYST service computer;
- OBD-II on-board diagnostics; and,
- Iridium spark plugs (with 100,000 km service interval).
M111 E 23 ML EVO
Relative to the M111 EVO engine, the supercharged M111 E 23 ML EVO engine was distinguished by its:
- Unique pistons made of heat-resistant alloy with higher copper and nickel content, and reinforced piston crowns;
- Sodium-cooled exhaust valves;
- Variable intake camshaft operation;
- Extended coolant pump belt;
- Stainless steel ring for the cylinder head gasket; and,
- Lower compression ratio.
| Engine | Capacity | Bore/stroke | Peak power | Peak torque | Years |
|---|---|---|---|---|---|
| M111 E 18 | 1799 cc | 85.3 x 78.7 | 90 kW at 5500 rpm | 170 Nm at 4200 rpm | 1993-97 |
| 90 kW at 5500 rpm | 170 Nm at 3700 rpm | 1997-00 | |||
| M111 E 20 EVO | 1998 cc | 89.9 x 78.7 | 95 kW at 5500 rpm | 185 Nm at 3500 rpm | 2000-02 |
| M111 E 20 | 1998 cc | 89.9 x 78.7 | 95 kW at 5100 rpm | 186 Nm at 3600 rpm | 1996-06 |
| 1998 cc | 89.9 x 78.7 | 100 kW at 5500 rpm | 190 Nm at 4000 rpm | 1992-97 | |
| 1998 cc | 89.9 x 78.7 | 100 kW at 5500 rpm | 190 Nm at 3700 rpm | 1997-00 | |
| M111 E 20 ML | 1998 cc | 89.9 x 78.7 | 132 kW at 5400 rpm | 250 Nm at 2500-4800 rpm | 1995-96 |
| 1998 cc | 89.9 x 78.7 | 141 kW at 5400 rpm | 270 Nm at 2500-4800 rpm | 1996-00 | |
| M111 E 20 ML EVO | 1998 cc | 89.9 x 78.7 | 120 kW at 5300 rpm | 230 Nm at 2500-4800 rpm | 2000-04 |
| M111 E 22 | 2199 cc | 89.9 x 86.6 | 110 kW at 5500 rpm | 210 Nm at 4000 rpm | 1992-96 |
| M111 E 23 | 2295 cc | 90.9 x 88.4 | 105 kW at 5000 rpm | 210 Nm at 4000 rpm | 1996-99 |
| 2295 cc | 90.9 x 88.4 | 105 kW at 5000 rpm | 215 Nm at 3500 rpm | 1999-06 | |
| 2295 cc | 90.9 x 88.4 | 110 kW at 5400 rpm | 220 Nm at 3700 rpm | 1995-97 | |
| 2295 cc | 90.9 x 88.4 | 110 kW at 5400 rpm | 220 Nm at 3800 rpm | 1997-00 | |
| M111 E 23 ML | 2295 cc | 90.9 x 88.4 | 142 kW at 5300 rpm | 280 Nm at 2500-4800 rpm | 1995-00 |
| M111 E 23 ML EVO | 2295 cc | 90.9 x 88.4 | 144 kW at 550 rpm | 280 Nm at 2500-5000 rpm | 2000-04 |
