Mercedes-Benz M110 engine

The M110 engine family is a DOHC (double overhead cam) crossflow cylinder head design with 2 valves per cylinder straight-6 automobile engine made by Mercedes-Benz in the 1970s and 1980s.

Mercedes-Benz M110 engine
Overview
ManufacturerMercedes-Benz
Production1972–1986
Layout
ConfigurationNaturally aspirated Straight-6
Displacement2.7 L (2,746 cc)
Cylinder bore86 mm (3.39 in)
Piston stroke78.8 mm (3.10 in)
ValvetrainDOHC 2 valves x cyl.
Compression ratio9.0:1
Combustion
Fuel systemSolex 4A1 carburetor
Fuel injection
ManagementBosch Jetronic
Fuel typeGasoline
Oil systemPressure circulation
Cooling systemWater cooled
Output
Power output105–136 kW (143–185 PS; 141–182 hp)
Torque output226–240 N⋅m (167–177 lb⋅ft)
Chronology
PredecessorM180
SuccessorM103

The M110.92x and .93x engines are carburetor engines, with Solex 4A1 carburetor.

The M110.98x and .99x engines are fuel-injected engines, with Bosch D-Jetronic up to the .983 and K-Jetronic from the .984.

All M110 engines have a displacement of 2.7 L; 167.6 cu in (2,746 cc) and a bore and stroke of 86 mm × 78.8 mm (3.39 in × 3.10 in). Firing order is 1-5-3-6-2-4. Amount of coolant in the radiator was 11 litres (2.9 US gal; 2.4 imp gal) from 1972 and 12 litres (3.2 US gal; 2.6 imp gal) from 1980s and on. Amount of oil (lubricant) in engine was 6 litres (1.6 US gal; 1.3 imp gal). Lubrication system was pressure circulation lubrication system. Number of valves was 1 intake, 1 exhaust with V-shaped overhead configuration. Valve operation was 2 top camshafts and camshaft drive was duplex roller-type chain.

The M110 .92x and .93x carburetor engines were replaced by the SOHC 2.6L M103 while .98x and .99x fuel-injected engines were replaced by 3.0L M103 starting in 1986.

M110.921 / M110.931

The .931 is the low-compression version of the .921.

  • Power output of .921: 118 kW (160 PS; 158 hp) at 5500 rpm.
  • Power output of .931: 107 kW (145 PS; 143 hp) at 5500 rpm.

Applications:

M110.922 / M110.932

The .932 is the low-compression version of the .922.

Power output of .922: 118 kW (160 PS; 158 hp) at 5500 rpm.
Power output of .932: 107 kW (145 PS; 143 hp) at 5500 rpm.

Applications:

M110.923

Power output: 115 kW (156 PS; 154 hp) at 5500 rpm, or 105 kW (143 PS; 141 hp) at 5500 rpm for the low-compression version.

Applications:

M110.924

Power output: 115 kW (156 PS; 154 hp) at 5500 rpm, or 105 kW (143 PS; 141 hp) at 5500 rpm for the low-compression version.

Applications:

M110.926

Power output: 115 kW (156 PS; 154 hp) at 5500 rpm, or 105 kW (143 PS; 141 hp) at 5500 rpm for the low-compression version.

Applications:

M110.981 / M110.991

The M110.981 uses Bosch D-Jetronic injection. This system senses the ambient temperature, engine temperature, intake manifold underpressure and throttle valve position and calculates with an analog computer how many milliseconds the fuel injectors should stay open per revolution.

The .991 is the low-compression version of the .981.

Power output of .981: 136 kW (185 PS; 182 hp) at 6000 rpm and 176 lb⋅ft (239 N⋅m) of torque at 4500 rpm.
Power output of .991: 125 kW (170 PS; 168 hp) at 6000 rpm.

Applications:

M110.982 / M110.992

The .992 is the low-compression version of the .982.

Power output of .982: 136 kW (185 PS; 182 hp) at 6000 rpm.
Power output of .992: 125 kW (170 PS; 168 hp) at 6000 rpm.

Applications:

M110.983 / M110.993

The .993 is the low-compression version of the .983.

Power output of .983: 136 kW (185 PS; 182 hp) at 6000 rpm.
Power output of .993: 125 kW (170 PS; 168 hp) at 6000 rpm.

Applications:

M110.984

The M110.984 was the first engine with the new Bosch K-Jetronic injection. This system is mechanical. The air that is taken in is weighed to the determine the amount of fuel to inject.

Power output: 130 kW (177 PS; 174 hp) at 6000 rpm up to April 1978; 136 kW (185 PS; 182 hp) at 5800 rpm from April 1978.

Applications:

M110.985

Power output: 132 kW (179 PS; 177 hp) at 6000 rpm up to April 1978; 136 kW (185 PS; 182 hp) at 5800 rpm from April 1978.

Applications:

M110.986

Power output: 132 kW (179 PS; 177 hp) at 6000 rpm up to April 1978; 136 kW (185 PS; 182 hp) at 5800 rpm from April 1978.

Applications:

M110.987

Power output: 136 kW (185 PS; 182 hp) at 5800 rpm. Maximum torque: 240 N⋅m (177 lb⋅ft) at 4500 rpm. Compression ratio: 9.0:1

Applications:

M110.988

Maximum output was 136 kW (185 PS; 182 hp) at 5800 rpm
Maximum torque was 240 N⋅m (177 lb⋅ft) at 4500 rpm
The compression ratio was 9.0:1.

Applications:

M110.989

Power output: 136 kW (185 PS; 182 hp) at 5800 rpm.
Maximum torque: 240 N⋅m (177 lb⋅ft) at 4500 rpm.
The compression ratio: 9.0:1.

Applications:

M110.990

Power output: 136 kW (185 PS; 182 hp) at 5800 rpm.

Applications:

M110.994

This engine was specifically produced for the G-Class Geländewagen. It has a low compression ratio. It uses K-Jetronic.

Power output: 115 kW (156 PS; 154 hp) at 5250 rpm up to 1984; 110 kW (150 PS; 148 hp) at 5250 rpm from 1984. Torque: 226 N⋅m (167 lb⋅ft) at 4250 rpm.

Applications:

See also

References
  • Mercedes-Benz "Werkstatt-Literatur Type 107" repair manual CD, page "M110 Motoren- und Typenübersicht"
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