Mercedes-Benz M102 engine
The M102 engine family was a straight-4 gasoline automobile engine from 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.
| Mercedes-Benz M102 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| 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 (2,463 cc) 2.5 L (2,498 cc) |
| Cylinder bore | 89 mm (3.5 in) 95.5 mm (3.76 in) 97.3 mm (3.83 in) |
| Piston stroke | 80.25 mm (3.16 in) 82.8 mm (3.26 in) |
| Valvetrain | SOHC 2 valves x cyl. DOHC 4 valves x cyl. |
| Compression ratio | 10.5:1 |
| Combustion | |
| Fuel system | 175 CDT Carburettor 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) |
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 carburettor 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:
M102.921
Similar to M102.920, but less power due to a different camshaft and different carburettor. 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).
Applications:
- 1985-1992 W124 200
M102.924
Similar to M102.921, different carburettor, 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).
Application
- 1986-1990 W201 190 (201.023)
M102.938
Low compression version of M102.921. Power output: 63 kW (86 PS; 84 bhp).
Application
M102.939
Low compression version of M102.920. Power output: 74 kW (101 PS; 99 bhp).
Application
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
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: 66 kW (90 PS; 89 bhp)
Applications:
- 1985-1993 W201 190E
M102.963
2.0–litre version with KE-Jetronic fuel injection. Cubic capacity: 1,997 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 KE-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
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:
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:
See also
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.