Mercedes-Benz M104 engine
The Mercedes-Benz M104 was a straight-6 automobile engine produced from 1990 through 1997. 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 under license by SsangYong Motor Company of Korea.
3.0 L M104.98x
This 3.0 L 24v DOHC engine replaced the 12v 3.0 L M103 engine. It was found in the W124 300E-24 models, W124 300CE-24 models, W124 300TE-24 models and R129 300SL-24 models. The 3.0 L M104 produced 215 hp(162 kW) and features KE-Jetronic fuel injection, cylinder specific ignition-timing, variable valve timing and under-piston cooling jets. It was replaced by the 2.8 L and 3.2 L M104 engines.
2.8 L M104.94x
After the W124 received a facelift 2 capacities replaced the 3.0 litre, a 2.8 litre lower power version and a 3.2 litre version. The 2.8 L M104 produced 197 hp(145kW) at 5500 rpm. Max torque was 270 N·m at 3750 rpm. Lubrication system is pressure circulation lubrication. Amount of oil in engine is 7.5 litres and amount of coolant in engine is 9 litres. Number of valves is 2 intake and 2 exhaust with V-shaped overhead configuration. Valve operation is 2 top camshaft. Camshaft drive is duplex roller chain. Starter motor is electrical with 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).
3.2 L M104.99x
The 3.2 L (3199 cc) version produced 220 hp (161 kW) at 5500 rpm and 310 N·m (229 ft·lbf) at 3750 rpm. This engine was found in the W124 and W210 E-Class, W140 S-Class, W463 G-Class, and R129 SL-Class.
AMG 3.4 L
There were 3.4 L conversions done to the 3.0 L M104.980 by AMG, prior to their formal cooperation with Daimler Benz.
AMG 3.6 L M104.941
There were 3.6 L conversions done to both the M103 and M104 by Brabus, among others.
The AMG 3.6 M104 was rated at 276 horsepower (206 kW) at 5,750 rpm and 284 foot-pounds force (385 N·m) of torque at 4,000 rpm using the HFM engine management system.
The boost in power was obtained by stroking the 2,8 litre M104 using the crank from the 350sd engine.
Turbocharger kits were offered for both the M103 and M104 engines by Turbo Technics, Mosselman, Lotec and other tuners. These conversions typically raised engine output to between 300 and 400 horsepower (300 kW). During the 1990s UK customers were able to buy new vehicles eqipped with a Turbo Technics conversion directly from Mercedes dealer Hughes of Beaconsfield (limited run of 75 conversions).