Mercedes-Benz M104 engine


The Mercedes-Benz M104 is a straight-6 automobile engine produced from 1989 through 1999. It has 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. The bore spacing on all M104 engines is same the M103 engine at 97mm.

2.8 L M104.900

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.

3.0 L M104.98x

This 24v was introduced as a sports car resp. top model completing the line-up of M103 12V engines. The M104 featured dual overhead camshafts and four valves per cylinder. The M103 and M104.98x were later replaced by the 2.8-litre and 3.2-litre versions of the M104. Bore is 88.5 mm and stroke is 80.2 mm with a compression ratio of 10:1. The M104 produced and features KE-Jetronic fuel injection, cylinder specific ignition-timing, variable valve timing and under-piston cooling jets.
Applications:
In 1993, two capacities replaced the 3.0 litre: a replaced the old single-cam M103 engine and the 3.2 litre M104.99x replaced the double-cam M104.98x. The 2.8 L M104 produced at 5500 rpm. Maximum torque was at 3750 rpm. Bore is 89.9 mm and stroke is 73.5 mm. Lubrication system is pressure circulation lubrication. Amount of oil in engine was (which was later revised to and amount of coolant in engine is. The camshaft is driven by duplex roller chain. The electrical starter motor produces. Ignition system is ignition mapping control.
Applications:
The version produced at 5500 rpm and at 3750 rpm. Bore is 89.9 mm and stroke is 84 mm. On all 24 valve M104 engines Intake valves are and the exhaust valves are. The Compression ratio is the same 10.0:1 on all W210, R129,and W140 but it did differ from 9.2:1 to 10.0:1 on W124.
Applications:
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 developed a 3.4 L M104 that was used principally in the 300E AMG 3.4, AMG 3.4 CE and 300TE-3.4 AMG vehicles, produced between 1988-1993. Few of this engine was originally on SL 3.4 AMG. Bore and stroke is. Output is at 6500 rpm and at 4500 rpm.
The engine oil capacity is and coolant volume is. It uses Bosch KE-Jetronic injection.

AMG 3.6 L M104.941/M104.992

There were 3.6 L conversions done to both the M103 and M104 by Brabus, among others.
AMG developed a M104 that was used in the W202 C36 AMG from M104.941, the W124 E36 AMG from M104.992, the E36 AMG, and the G36 AMG vehicles.
The AMG 3.6 M104 was rated at at 5,750 rpm and of torque at 4,000 rpm using the HFM engine management system. Bore and stroke is. The Compression ratio is 10.5 AMG later conceded that since the engine was hand modified, power outputs could vary slightly from.
The boost in displacement was obtained by boring the 2.8 litre M104 block by and using a highly modified version of the crankshaft from the 3.5L OM603 to increase throw by ; this necessitated the use of new forged pistons with shorter skirts. A larger intake crossover pipe, freer-flowing exhaust, a unique intake camshaft, minor changes to the cylinder head, and modifications to the HFM fuel computer also contribute to the increase in power.
Ssangyong of South Korea makes a 3.6 litre variant of M104 inline-six engine based on the 2.8 litre model, producing, for its Chairman model, a full-size luxury sedan.

Turbo Conversions

kits were offered for both the M103 and M104 engines by Turbo Technics, Mosselman, Lotec, MAD Modify, Turbobandit and other tuners. These conversions typically raised engine output to between, depend on Boost Target.
During the 1990s UK customers were able to buy new vehicles equipped with a Turbo Technics conversion directly from Mercedes dealer Hughes of Beaconsfield. Today turbocharger kits for M103-M104 engines are available from later tuners in Europe and Asia.