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. The same engine was produced in several versions with differing volume, compression, and horse power according to its application.

M115.920
The M115.920 is a 2178 cc engine with a power output 103-105 hp. 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 2178 cc 85 hp engine.

Applications:
 * L 408 G

M115.923
The M115.923 is a 1988 cc 70 kW engine.

Applications:
 * 1968-1976 200 (W115.015)

M115.924
The M115.924 is a 2178 cc, 90-120 hp engine, depending on compression.

Applications:
 * 1968-1973 220

M115.926
The M115.926 is a 2178 cc, 63-70 kW engine, depending on compression.

Applications:
 * 1968-1977 220

M115.938
The M115.938 is a 1988 cc engine with a bore and stroke of 87x83.6 mm. Power output was 70 kW.

Applications:
 * 1975-1980 200

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

Applications:
 * 1976-1980 200

M115.951
The M115.951 is a 2.3-liter 110 hp engine.

Applications:
 * 1973-1979 230.4 (W115.017)

M115.952
The M115.952 is a 2277 cc engine with 89 hp.

Applications:
 * 409 LF Transporter

M115.954
The M115.954 is a 2307 cc version with a 93.8 mm bore and the same 83.6 mm stroke. Power output was 81 kW.

Applications:
 * 1976-1981 230
 * 1976-1981 230C
 * 1976-1981 230T

M 115.973
The M 115.973 is a 2307 cc version with a 93.8 mm bore and the same 83.6 mm stroke. Power output was 67 –.

Applications:
 * 1979–1982 230 G
 * 1972–1990 230 GE

M 115.973 2.6 Brabus
The M 115.973 2.6 Brabus is a 2,587 cc version with a 93.8 mm bore and the same 83.6 mm stroke. Power output was 114 kW.

Applications:
 * 1989–1990 230 GE 2.6 Brabus