Mercedes-Benz M104 engine
| M104 | |
|---|---|
| Overview | |
| Manufacturer | Mercedes-Benz AG |
| Production | 1989-99 |
| Combustion chamber | |
| Configuration | Straight-6 (Except M104.900, refer VW VR6) |
| Displacement | 2.8 litres (171 cu in) M104.94x 3.0 litres (183 cu in) M104.98x 3.2 litres (195 cu in) M104.99x 3.6 litres (220 cu in) M104.941 |
| Cylinder bore | 88.50 mm (3.484 in) M104.98x |
| Piston stroke | 80.20 mm (3.157 in) M104.98x |
| Cylinder block alloy | Cast iron |
| Valvetrain | DOHC, 4 valves per cylinder |
| Compression ratio | 9.2, 10.0 and 10.5 on AMG models |
| Combustion | |
| Fuel system | Bosch KE-Jetronic electronically controlled, mechanical fuel injection |
| Management | Electronic |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Cooling system | Water cooled |
| Output | |
| Power output | 162 kW (217 hp) SAE J 1349 M104.98x |
| Torque output | 265 N·m (195 lb·ft) @ 4600 RPM M104.98x |
| Chronology | |
| Predecessor | M 103 |
| Successor | M 112 |
The Mercedes-Benz M104 was a straight-6 automobile engine produced from 1989 through 1999. It was a double overhead cam design with 4 valves per cylinder. It replaced the M103 and was replaced by the M112 V6 starting in 1997. The M104 continued in production until 1999 where its last use by Mercedes-Benz was in the W140 chassis.
Mercedes needed a compact 6 cylinder for their vans and asked Volkswagen if they could use the VR6 Golf/Jetta engine. An agreement was reached and the engines were sold semi completed to MB. Basically only the engine cover and aircleaner housing is by MB.
This 3.0 L (2960 cc) 24v DOHC was introduced as a sports car resp. top model completing the line-up of M103 12V engines. M103 and this engine were replaced by the later 2.8l and 3.2l versions of M104. It was found in the W124 300E-24 models, C124 300CE-24 models, T124 300TE-24 models and R129 300SL-24 models. The 3.0 L M104 produced 217 hp (162 kW) to 228 hp(without catalytic version) and features KE-Jetronic fuel injection, cylinder specific ignition-timing, variable valve timing and under-piston cooling jets.
In 1993, two capacities replaced the 3.0 litre: a 2.8 litre replaced an old single-cam M103 engine and a 3.2 litre replaced a double-cam M104.98X. The 2.8 L M104 produced 193 hp (142 kW) at 5500 rpm. Max torque was 270 N·m or 199 ft/lbs at 3750 rpm. Lubrication system is pressure circulation lubrication. Amount of oil in engine was 7.5 litres (which was later revised to 7 litres) and amount of coolant in engine is 9 litres. The 2.8 features dual overhead camshafts and four valves per cylinder. The camshaft is driven by duplex roller chain. The electrical starter motor produces 1.7 kW. Ignition system is ignition mapping control. The 2.8 L M104 was also used in the W202 C-Class model C280 and in the W140 S-Class model S280 (the latter was not sold in North America).
...
Wikipedia