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Mercedes Benz M110 engine

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Manufacturer
  
Mercedes-Benz

Class
  
Straight-6 DOHC

Production
  
1972–1986

Engine
  
2.8 L (2746 cc)

Mercedes-Benz M110 engine

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.

Contents

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 2.8 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 1972 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:

  • 1972-1976 280 (W114)
  • 1972-1976 280C (W114)

    • 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:

  • 1972-1980 280S (W116)

    • M110.923

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

    Applications:

  • 1975-1981 280 (W123)
  • 1975-1981 280C (W123)

    • M110.924

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

    Applications:

  • 1979-1985 280S (W126)

    • M110.926

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

    Applications:

  • 1979-1985 280S (W126)

    • 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:

  • 1972-1976 280E (W114)
  • 1972-1976 280CE (W114)

    • 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 (R107)
  • 1973-1976 280SLC (C107)

    • 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:

  • 1972-1975 280SE (W116)
  • 1972-1975 280SEL (W116)

    • 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:

  • 1975-1981 280E (W123)
  • 1975-1981 280CE (W123)
  • 1975-1981 280TE (W123)

    • M110.985

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

    Applications:

  • 1976-1980 280SE (W116)
  • 1976-1980 280SEL (W116)

    • 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 (R107)
  • 1976-1985 280SLC (C107)

    • M110.987

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

    Applications:

  • 1979-1985 280SE (W126)
  • 1979-1985 280SEL (W126)

    • 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:

  • 1978-1986 280E (W123)
  • 1978-1986 280TE (W123)
  • 1978-1986 280CE (W123)

    • M110.989

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

    Applications:

  • 1981.10-1985 280SE (W126)
  • 1981.10-1985 280SEL (W126)

    • M110.990

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

    Applications:

  • 1976-1985 280SL (R107)
  • 1976-1985 280SLC (C107)

    • 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:

  • 1979-1989 280GE (W460)

    • References

    Mercedes-Benz M110 engine Wikipedia
    (Text) CC BY-SA


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