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 | |
| Manufacturer | Mercedes-Benz |
| Production | 1972–1986 |
| Layout | |
| Configuration | Naturally aspirated Straight-6 |
| Displacement | 2.7 L (2,746 cc) |
| Cylinder bore | 86 mm (3.39 in) |
| Piston stroke | 78.8 mm (3.10 in) |
| Valvetrain | DOHC 2 valves x cyl. |
| Compression ratio | 9.0:1 |
| Combustion | |
| Fuel system | Solex 4A1 carburetor Fuel injection |
| Management | Bosch Jetronic |
| Fuel type | Gasoline |
| Oil system | Pressure circulation |
| Cooling system | Water cooled |
| Output | |
| Power output | 105–136 kW (143–185 PS; 141–182 hp) |
| Torque output | 226–240 N⋅m (167–177 lb⋅ft) |
| Chronology | |
| Predecessor | M180 |
| Successor | M103 |
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:
- 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: 118 kW (160 PS; 158 hp) at 5500 rpm.
Power output of .932: 107 kW (145 PS; 143 hp) at 5500 rpm.
Applications:
- 1972-1980 280S (W116)
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:
- 1975-1981 280 (W123)
- 1975-1981 280C (W123)
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:
- 1979-1985 280S (W126)
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:
- 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: 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:
- 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: 136 kW (185 PS; 182 hp) at 6000 rpm.
Power output of .992: 125 kW (170 PS; 168 hp) at 6000 rpm.
Applications:
- 1973-1976 Mercedes-Benz 280SL
- 1973-1976 Mercedes-Benz 280SLC
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:
- 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: 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:
- 1975-1981 280E (W123)
- 1975-1981 280CE (W123)
- 1975-1981 280TE (W123)
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:
- 1976-1980 280SE (W116)
- 1976-1980 280SEL (W116)
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:
- 1976-1985 280SL (R107)
- 1976-1985 280SLC (C107)
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:
- 1979-1985 280SE (W126)
- 1979-1985 280SEL (W126)
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:
- 1978-1986 280E (W123)
- 1978-1986 280TE (W123)
- 1978-1986 280CE (W123)
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:
- 1981.10-1985 280SE (W126)
- 1981.10-1985 280SEL (W126)
M110.990
Power output: 136 kW (185 PS; 182 hp) at 5800 rpm.
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: 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:
- 1979-1989 280GE (W460)
See also
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References
- Mercedes-Benz "Werkstatt-Literatur Type 107" repair manual CD, page "M110 Motoren- und Typenübersicht"