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 compare to the M115 engine which was used during the same time frame.

Mercedes-Benz M102 engine
Overview
ManufacturerMercedes-Benz
Layout
ConfigurationStraight-4
Displacement1.8 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 bore89 mm (3.5 in)
95.5 mm (3.76 in)
97.3 mm (3.83 in)
Piston stroke80.25 mm (3.16 in)
82.8 mm (3.26 in)
ValvetrainSOHC 2 valves x cyl.
DOHC 4 valves x cyl.
Compression ratio10.5:1
Combustion
Fuel system175 CDT Carburettor
Multi-point fuel injection
ManagementBosch KE-Jetronic
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output63–173 kW (86–235 PS; 84–232 bhp)
Torque output154–245 N⋅m (114–181 lb⋅ft)
Dimensions
Dry weight118 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:

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 w/ 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:

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:

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

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

M102.962

An update to the M102.961 introduced in 1985, with a power output of about 90 PS (89 bhp; 66 kW). 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 kW (118 PS; 117 bhp)

Applications:

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:

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:

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:

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:

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:

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:

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:

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: 2,498 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:

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See also

References
  1. 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.
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