Mercedes Benz M111 W203 engine

The Mercedes-Benz M111 engine, when found in the W203 C-Class, is a 4-cylinder engine, specifically the M111.951, known for its >naturally aspirated configuration with a compression ratio of 10.6:1. It has a bore of 89.9 mm and a stroke of 78.7 mm. The EVO version, introduced later, features a reinforced cylinder block, new cylinder head, individual coil-on-plug ignition, and Siemens SIM4 fuel injection.

Key Specifications:

Engine Model: M111.951 (naturally aspirated)
Number of Cylinders: 4
Bore: 89.9 mm
Stroke: 78.7 mm
Compression Ratio: 10.6:1
Power Output: 95 kW (129 PS; 127 hp) at 5300 rpm (for EVO version)
Torque: 190 N⋅m (140 lb⋅ft) at 4000 rpm (for EVO version)
Fuel Injection: Siemens SIM4 (for EVO version)

Evolutionary Improvements (EVO Version):

Reinforced cylinder block and new cylinder head for improved durability and performance.
Individual coil-on-plug ignition with new iridium-tipped spark plugs for extended service intervals (100,000km/60,000 miles).
Connecting rods and pistons optimized for the higher compression ratio.
More advanced fuel injection system (Siemens SIM4) for better fuel delivery and emissions control.
Dual oxygen sensors and Euro IV emissions compliance.

Other Relevant Information:

The W203 C-Class also saw the introduction of the M112 V6 engine (e.g., C 240).
AMG versions of the W203 included the C 32 AMG with a supercharged 3.2L V6 and the C 55 AMG with a 5.4L V8.
The M111 engine was used in various Mercedes-Benz models, including the C-Class (W202 and W203), E-Class (W210), and CLK (C208).

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