Mercedes-Benz M104 engine


The Mercedes-Benz M104 is an automobile straight-six engine produced from 1988 through 1999. It has a double overhead cam design with 4 valves per cylinder, and used a crossflow cylinder head. It replaced the M103 engine|M103] and was replaced by the M112 engine|M112] V6 starting in 1997. The bore spacing on all M104 engines is the same as M103 engines.

2.8 L M104.900

As Mercedes needed a compact 6-cylinder for their Vito, they agreed with Volkswagen to use their VR6 engine, which they then designated M104.900. An agreement was reached and the engines were sold semi-completed to Mercedes-Benz. This version is unrelated to other engines designated M104. Only the engine cover and air cleaner housing is by Mercedes-Benz.

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.
The M104 featured KE-Jetronic fuel injection, cylinder specific ignition-timing, variable valve timing and under-piston cooling jets.
;Specifications
;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. W124 280 E was the only Mercedes-Benz model which get increased of power to.
;Specifications for 2.8 L
;Applications
For the, 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.W140 pre-facelift model 300 SE / SEL, W140 facelift model S320/ L and R129 SL320 used more powerful version of 3.2-liter M104 engine which produced.
;Specifications
;Applications:
There were 3.3 L conversions done to the 3.0 L M104.980 by AMG, during the early cooperation with Daimler Benz.
AMG developed a 3.3 L M104 that was used principally in the 300E AMG 3.4, AMG 3.4 CE and 300TE-3.4 AMG vehicles, produced between 1990 and 1992. A few of these engines were originally installed in the SL 3.4 AMG.
;Specifications for AMG 3.4
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 with a compression ratio of 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 engine|OM603] to increase throw by ; this necessitated the use of new forged pistons with shorter skirts. A larger intake crossover pipe, free-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 made a 3.6 litre variant of the M104 inline-six engine based on the 2.8 litre model, producing or on earlier versions, for its Chairman model, a full-size luxury sedan. The Chinese Roewe R95L, based on the SsangYong Chairman, also uses a 3.6 litre version of the M104 engine.
Last versions of the German sports car Isdera Spyder 036i after 1990 also use a 3.6 litre AMG variant of the M104, producing 268 or 282 hp.

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, depending 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.