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Mercedes-Benz M102 engine
Mercedes-Benz M102 engine
Overview
Manufacturer	Mercedes-Benz
Production	1980–1993
Layout
Configuration	Straight-4
Displacement	1.8 L (1,797 cc); 2.0 L (1,997 cc); 2.3 L (2,299 cc); 2.5 L (2,498 cc); 2.5 L (2,463 cc);
Cylinder bore	89 mm (3.504 in); 95.5 mm (3.760 in); 97.3 mm (3.831 in);
Piston stroke	72.2 mm (2.843 in); 80.25 mm (3.159 in); 87.2 mm (3.433 in); 82.8 mm (3.260 in);
Valvetrain	SOHC 2 valves per cylinder; DOHC 4 valves per cylinder;
Compression ratio	10.5:1
Combustion
Fuel system	175 CDT Carburetor; Multi-point fuel injection
Management	Bosch KE-Jetronic
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	63–173 kW (86–235 PS; 84–232 bhp)
Torque output	154–245 N⋅m (114–181 lb⋅ft)
Dimensions
Dry weight	118 kg (260 lb)
Chronology
Predecessor	Mercedes-Benz M115 engine
Successor	Mercedes-Benz M111 engine

The M102 engine family is a inline-four gasoline automobile engine family built by Mercedes-Benz in the 1980s and early 1990s. It is a relatively oversquare engine with a large bore and short stroke compared to the M115 engine which was used during the same timeframe.

M102.910

Used in the W201 190E 1.8 from 1990 onwards (badged as 180E in Australia from 1991 to 1993). Cubic capacity: 1,797 cc (1.8 L). Power output: 80 kW (109 PS; 107 bhp). Torque: 154 N⋅m (114 lb⋅ft)

Applications:

1990–1993 W201 180E and 190E 1.8

M102.920

The M102.920 was a 2.0 L engine with an bore and stroke 89 mm × 80.25 mm (3.50 in × 3.16 in). Equipped with carburetor 175 CDT. Cubic capacity: 1,997 cc (2.0 L). Power output: 80 kW (109 PS; 107 bhp). Swedish and Swiss market models developed 98 PS (72 kW) at 5000 rpm thanks to their stricter emissions regulations.^[1]

Applications:

1980–1986 W123 200
1980–1986 W123 200T

M102.921

Similar to M102.920, but less power due to a different camshaft and different carburetor. Power Output: 66 kW (90 PS; 89 bhp)

Applications:

1983–1985 W201 190 (201.022)

M102.922

An update of the M102.920 engine for use in the W124 chassis, Cubic capacity: 1,997 cc (2.0 L). Power output: 80 kW (109 PS; 107 bhp). During 1989 the bore was shrunk by 0.05 mm (0.0020 in), bringing the displacement down to 1996 cc. This change was applied across the board of all 2.0 and 2.3-litre M102 engines as part of running updates carried out between 1988 and 1990.

Applications:

1985–1992 W124 200

M102.924

Similar to M102.921, different carburetor, single-belt drive for alternator, power steering pump and air-conditioning compressor (where fitted). Hydraulic aided valvetrain. Power output: 77 kW (105 PS; 103 bhp).

Applications:

1986–1990 W201 190 (201.023)

M102.938

Low compression version of M102.921. Power output: 63 kW (86 PS; 84 bhp).

Applications:

W201 190

M102.939

Low compression version of M102.920. Power output: 74 kW (101 PS; 99 bhp).

Applications:

M102.961

A 2.0 L multi-point fuel-injected (KE-Jetronic) variation of the M102.921. An "E" was added to the model of the vehicle (standing for "einspritzung", the German word for fuel injection). This engine is identified by TSZ ignition and multiple belts for the alternator, power steering and air conditioning compressor (where fitted). Cubic capacity: 1,997 cc (2.0 L). Power output: 90 kW (122 PS; 121 bhp)

Application

1983–1985 W201 190E
1984 Apal Francochamps

M102.962

An update to the M102.961 introduced in 1985. This is identified by the EZL ignition system and a single accessory drive belt. Cubic capacity: 1,997 cc (2.0 L). Power output: 87–90 kW (118-122 PS; 117-120 bhp)

Applications:

1985–1993 W201 190E

M102.963

2.0–litre version with KE-Jetronic fuel injection. Cubic capacity: 1,996 cc (2.0 L). Power output: 90 kW (122 PS; 121 bhp)

Applications:

1985–1992 W124 200E.

M102.964

2.0–litre version with KE-Jetronic fuel injection for the italian W460. Cubic capacity: 1,997 cc (2.0 L). Power output: 90 kW (122 PS; 121 bhp)

Applications:

1986–1989 W460 200GE.

M102.980

The M102.980 was a 2.3 L version with a 95.5 mm (3.76 in) bore and the same 80.25 mm (3.16 in) stroke. Engine weight was 118 kg (260 lb). Used K-Jetronic fuel injection. Cubic capacity: 2,299 cc (2.3 L). Power output: 100 kW (136 PS; 134 bhp)

Applications:

1980–1986 W123 230E
1980–1986 W123 230CE
1980–1986 W123 230TE

M102.981

The M102.981 was a 2.3 L version with a 95.5 mm (3.76 in) bore and the same 80.25 mm (3.16 in) stroke. Cubic capacity: 2,299 cc (2.3 L). Power output: 92 kW (125 PS; 123 bhp)

Applications:

1979–1989 W460 230GE Geländewagen

M102.982

Similar to the M102.980 version, but with the newer KE-Jetronic system from Bosch. Cubic capacity: 2,299 cc (2.3 L). Power output: 97 kW (132 PS; 130 bhp)

Applications:

1985–1992 W124 230E
1985–1992 W124 230CE
1985–1992 W124 230TE

M102.983

A 16-valve version of the M102.985 with cylinder head designed by Cosworth.Cubic capacity: 2,299 cc (2.3 L). Power output: 138 kW (188 PS; 185 bhp); USA: 125 kW (170 PS; 168 bhp)

Applications:

1986–1987 W201 190E 2.3-16
1985–1989 Isdera Spyder 033i 2.3-16V

M102.985

An 8-valve M102 with a displacement of 2.3 L used in the W201 chassis with KE-Jetronic fuel injection. Cubic capacity: 2,299 cc (2.3 L). Power output: 97 kW (132 PS; 130 bhp)

Applications:

1985–1992 W201 190 E 2.3

M102.990

An update of the 16-valve version with increased capacity (2.5 L) and stiffening ribs, still with a cylinder head designed by Cosworth. Cubic capacity: 2,498 cc (2.5 L). Power output: 150 kW (204 PS; 201 bhp)

Applications:

1988–1993 W201 190E 2.5-16

M102.991

An update of the 2.5 16-valve version, with shorter stroke and larger bore. H beam rods and piston cooling jets. Cubic capacity: 2,463 cc (2.5 L). Power output: 147 kW (200 PS; 197 bhp)

Applications:

1989 W201 190E 2.5-16 Evolution

M102.992

An update of the 102.991 version with removal of four crankshaft counterweights and even more stiffening ribs for higher RPMs. Single timing chain, oil pump with separate drive chain. Bigger intake manifold, camshaft and exhaust system. Higher compression ratio 10.5:1. Cubic capacity: 2,463 cc (2.5 L). Power output: 173 kW (235 PS; 232 bhp)

Applications:

1990 W201 190E 2.5-16 Evolution II

References

^ Hogsten, Dag E. (1982-10-06). "Prestige till varje pris" [Prestige at any cost]. Teknikens Värld (in Swedish). Vol. 34, no. 21. Stockholm, Sweden: Specialtidningsförlaget AB. p. 26.