Mercedes-Benz M110 engine

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Mercedes-Benz M110 engine
Overview
Manufacturer Mercedes-Benz
Production 1973–1986
Body and chassis
Class Straight-6 DOHC
Powertrain
Engine 2.8 L (2746 cc)

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

The M110.92x and .93x engines are carburetor engines, with Solex or Pierburg 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 2.8 L (2746 cc) (170.8 cu in) and an 86 mm bore and 78.8 mm stroke. Firing order is 1-5-3-6-2-4. Amount of coolant in the radiator was 11 litres from 1970s and 12 litres from 1980s and on. Amount of oil (lubricant) in engine was 6 litres. 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: 160 hp (118 kW) at 5500rpm.
  • Power output of .931: 145 hp (107 kW) at 5500rpm.

Applications:

M110.922 / M110.932

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

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

Applications:

M110.923

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

Applications:

M110.924

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

Applications:

M110.926

Power output: 156 hp (115 kW) at 5500rpm, or 143 hp (105 kW) at 5500rpm 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: 185 hp (136 kW) at 6000rpm and 176 ft. lb of torque at 4500rpm.
Power output of .991: 170 hp (125 kW) at 6000rpm.

Applications:

M110.982 / M110.992

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

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

Applications:

  • 1973-1976 280SL
  • 1973-1976 280SLC

M110.983 / M110.993

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

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

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

Applications:

M110.985

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

Applications:

M110.986

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

Applications:

  • 1976-1985 280SL
  • 1976-1985 280SLC

M110.987

Power output: 185 hp (136 kW) at 5800rpm. Maximum torque: 240 Nm at 4500rpm. Compression ratio: 9.0:1

Applications:

M110.988

Maximum output was 185 hp (136 kW) at 5800rpm
Maximum torque was 240 Nm at 4500rpm
The compression ratio was 9.0 : 1.

Applications:

M110.989

Power output: 185 hp (136 kW) at 5800rpm.
Maximum torque: 240 Nm at 4500rpm.
The compression ratio: 9.0 : 1.

Applications:

M110.990

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

Applications:

  • 1976-1985 280SL
  • 1976-1985 280SLC

M110.994

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

Power output: 156 hp (115 kW) at 5250rpm up to 1984; 150 hp (110 kW) at 5250rpm from 1984. Torque: 226 Nm at 4250rpm.

Applications:

See also

Wikimedia Commons has media related to Mercedes-Benz M110 engine.

References

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