Mercedes-Benz M115 engine

The M115 engine family was a straight-4 automobile engine from Mercedes-Benz that was produced during the 1970s. This engine was a successor from the M121 and was replaced by the M102 engine. This engine is modified from the M121 by adding a five-bearing crankshaft. [2] The same engine was produced in several versions with differing volume, compression, and horse power according to its application.

Mercedes-Benz M115 engine
Overview
ManufacturerMercedes-Benz
Production1968 to 1985 [1]
Layout
ConfigurationStraight-4
Displacement
  • 2.0 L (1,988 cc)
  • 2.2 L (2,178 cc)
  • 2.3 L (2,277 cc)
  • 2.3 L (2,307 cc)
Cylinder bore
  • 87 mm (3.43 in)
  • 93.8 mm (3.69 in)
Piston stroke
  • 83.6 mm (3.29 in)
  • 92.4 mm (3.64 in)
Combustion
Fuel typeGasoline
Cooling systemWater cooled
Output
Power output85–120 hp (63–89 kW; 86–122 PS)
Chronology
PredecessorMercedes-Benz M121 engine
SuccessorMercedes-Benz M102 engine

M115.920

The M115.920 is a 2.2 L (2,178 cc) engine with a power output 103–105 hp (77–78 kW; 104–106 PS). The cylinder bore on this type is 87 mm and piston stroke is 92.4 mm. This type shares the crankshaft with OM615 220D.

Applications:

  • 1968-1973 220 (W115.010) with oil radiator

M115.921

The M115.921 is a 2.2 L (2,178 cc) 85 hp (63 kW; 86 PS) engine.

Applications:

M115.923

The M115.923 is a 2.0 L (1,988 cc) 70 kW (95 PS; 94 hp) engine.

Applications:

  • 1968-1976 200 (W115.015)

M115.924

The M115.924 is a 2.2 L (2,178 cc), 90–120 hp (67–89 kW; 91–122 PS) engine, depending on compression.

Applications:

M115.926

The M115.926 is a 2.2 L (2,178 cc), 63–70 kW (86–95 PS; 84–94 hp) engine, depending on compression.

Applications:

M115.938

The M115.938 is a 2.0 L (1,988 cc) engine with a bore and stroke of 87 mm × 83.6 mm (3.43 in × 3.29 in). Power output was 70 kW (95 PS; 94 hp).

Applications:

M115.939

The M115.939 is a 2.0-litre 84 hp (63 kW; 85 PS) engine with reduced compression, which follows from a different head. Was e.g. built for export to Switzerland.

Applications:

M115.951

The M115.951 is a 2.3-liter 110 hp (82 kW; 112 PS) engine.

Applications:

  • 1973-1979 230.4 (W115.017)

M115.952

The M115.952 is a 2.3 L (2,277 cc) engine with 89 hp (66 kW; 90 PS).

Applications:

M115.954

The M115.954 is a 2.3 L (2,307 cc) version with a 93.8 mm (3.69 in) bore and the same 83.6 mm (3.29 in) stroke. Power output was 81 kW (110 PS; 109 hp).

Applications:

M 115.973

The M 115.973 is a 2.3 L (2,307 cc) version with a 93.8 mm (3.69 in) bore and the same 83.6 mm (3.29 in) stroke. Power output was 67–93 kW (91–126 PS; 90–125 hp).

Applications:

M 115.973 2.6 Brabus

The M 115.973 2.6 Brabus is a 2.6 L (2,587 cc) version with a 93.8 mm (3.69 in) bore and the same 83.6 mm (3.29 in) stroke. Power output was 114 kW (155 PS; 153 hp).

Applications:

See also

References
  1. "Mercedes M 115 engine (1968-1985)". Motor Car History. Retrieved 2023-09-04.
  2. "Mercedes M 115 engine (1968-1985)". Motor Car History. Retrieved 2023-09-04.


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