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. 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 2746 cc and a bore and stroke of 86x78.8 mm. Firing order is 1-5-3-6-2-4. Amount of coolant in the radiator was 11 L from 1972 and 12 L from 1980s and on. Amount of oil (lubricant) in engine was 6 L. Lubrication system was pressure circulation lubrication system. Number of valves was 1 intake, 1 exhaust with V-shaped overhead configuration, acted by rocker arms. 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. Applications:

M110.922 / M110.932

The .932 is the low-compression version of the .922. Power output of .922: 118 kW at 5500 rpm. Power output of .932: 107 kW at 5500 rpm. Applications:

M110.923

Power output: 115 kW at 5500 rpm, or 105 kW at 5500 rpm for the low-compression version. Applications:

M110.924

Power output: 115 kW at 5500 rpm, or 105 kW at 5500 rpm for the low-compression version. Applications:

M110.926

Power output: 115 kW at 5500 rpm, or 105 kW 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 at 6000 rpm and 176 lbft of torque at 4500 rpm. Power output of .991: 125 kW at 6000 rpm. Applications:

M110.982 / M110.992

The .992 is the low-compression version of the .982. Power output of .982: 136 kW at 6000 rpm. Power output of .992: 125 kW at 6000 rpm. Applications:

M110.983 / M110.993

The .993 is the low-compression version of the .983. Power output of .983: 136 kW at 6000 rpm. Power output of .993: 125 kW 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 then determine the amount of fuel to inject. Power output: 130 kW at 6000 rpm up to April 1978; 136 kW at 5800 rpm from April 1978. Applications:

M110.985

Power output: 132 kW at 6000 rpm up to April 1978; 136 kW at 5800 rpm from April 1978. Applications:

M110.986

Power output: 132 kW at 6000 rpm up to April 1978; 136 kW at 5800 rpm from April 1978. Applications:

M110.987

Power output: 136 kW at 5800 rpm. Maximum torque: 240 Nm at 4500 rpm. Compression ratio: 9.0:1 Applications:

M110.988

Maximum output was 136 kW at 5800 rpm Maximum torque was 240 Nm at 4500 rpm The compression ratio was 9.0:1. Applications:

M110.989

Power output: 136 kW at 5800 rpm. Maximum torque: 240 Nm at 4500 rpm. The compression ratio: 9.0:1. Applications:

M110.990

Power output: 136 kW 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 at 5250 rpm up to 1984; 110 kW at 5250 rpm from 1984. Torque: 226 Nm at 4250 rpm. Applications:

M110.998/995 by AMG

Own tuning version of the 2.7-liter M110 engine was presented at the end of the 70s by the then independent AMG division for the W123 models (sedan, coupe and station wagon) and W116 in long and short body versions. After modifications by specialists from Affalterbach, the power of naturally aspirated engine increased from the standard 136 kW and 240 Nm of torque up to 156 kW and 255 Nm. Applications: