The

Mercedes-Benz Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...

M104 is a

straight-6 The straight-six engine (also referred to as an inline-six engine; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft. A straight-six engine has perfect primary and secondary engine bal ...

automobile A car or automobile is a motor vehicle with Wheel, wheels. Most definitions of ''cars'' say that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, pe ...

engine produced from 1989 through 1999. It has a

double overhead cam An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion cha ...

design with 4 valves per cylinder, and used a

crossflow cylinder head A crossflow cylinder head is a cylinder head that features the intake and exhaust ports on opposite sides. The gases can be thought to flow across the head. This is in contrast to reverse-flow cylinder head designs that have the ports on the same ...

. 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 The Mercedes-Benz W140 is a series of flagship vehicles manufactured by Mercedes-Benz from 1991 to 1998 in sedan/saloon and coupe body styles and two wheelbase lengths (SE and SEL). Mercedes-Benz unveiled the W140 S-Class at Geneva Motor Show in ...

chassis. 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 Vito is an Italian name that is derived from the Latin word "''vita''", meaning "life". It is a modern form of the Latin name Vitus, meaning "life-giver," as in San Vito or Saint Vitus, the patron saint of dogs and a heroic figure in southern ...

, they agreed with

Volkswagen Volkswagen (),English: , . abbreviated as VW (), is a German Automotive industry, motor vehicle manufacturer headquartered in Wolfsburg, Lower Saxony, Germany. Founded in 1937 by the German Labour Front under the Nazi Party and revived into a ...

to use their

VR6 VR6 engines are V6 piston engines with a narrow angle between the cylinder banks and a single cylinder head covering both banks of cylinders. Volkswagen Group introduced the first VR6 engine in 1991 and VR6 engines currently remain in producti ...

engine, which they then designated M104.900. An agreement was reached and the engines were sold semi-completed to

. This version is unrelated to other engines designated M104. Only the engine cover and aircleaner housing is by Mercedes-Benz.

3.0 L M104.98x

This or (2962 cc on Isdera Spyder 036i) 24v was introduced as a sports car resp. top model completing the line-up of M103 12V engines. The M104 featured

dual overhead camshaft An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion cha ...

s 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 Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All comp ...

, cylinder specific ignition-timing,

variable valve timing In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with varia ...

and under-piston cooling jets. ;Specifications *

Engine power Engine power is the power that an engine can put out. It can be expressed in power units, most commonly kilowatt, pferdestärke (metric horsepower), or horsepower. In terms of internal combustion engines, the engine power usually describes the ''r ...

@ 6400 rpm: (without

catalytic converter A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Catalytic converters are usually ...

) *

Torque In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of th ...

@ 4600 rpm: (without catalytic converter) * Bore and stroke: *

Compression ratio The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

: 10:1 ;Applications: * 1989–1992 C124 300 CE-24 * 1989–1993 R129 300SL-24 * 1990–1993 W124 300 E-24 * 1990–1993 S124 300 TE-24 *1987—1993 Isdera Spyder 036i 3.0-24V

2.8 L M104.94x

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. ;Specifications for 2.8 L *

@ 5500 rpm: or 145–148 kW (197 PS; 195 hp/201PS; 199 hp) on

SsangYong The SsangYong Motor Company ( ko, 쌍용자동차 주식회사) is a South Korea–based automobile manufacturer. It traces its origins back to a manufacturer established in 1954. The name SsangYong appeared in 1988, after its acquisition by the ...

models *

@ 3750 rpm: or 271–277 N·m (199–204 lb·ft) on

models * Bore and stroke: *

Lubrication Lubrication is the process or technique of using a lubricant to reduce friction and wear and tear in a contact between two surfaces. The study of lubrication is a discipline in the field of tribology. Lubrication mechanisms such as fluid-lubric ...

system: pressure circulation * Oil capacity: * Coolant capacity: * Camshaft drive: duplex roller chain *

Starter motor A starter (also self-starter, cranking motor, or starter motor) is a device used to rotate (crank) an internal-combustion engine so as to initiate the engine's operation under its own power. Starters can be electric motor, electric, pneumatic ...

: 1.7 kW electrical motor *

Ignition system An ignition system generates a spark or heats an electrode to a high temperature to ignite a fuel-air mixture in spark ignition internal combustion engines, oil-fired and gas-fired boilers, rocket engines, etc. The widest application for spark ig ...

: ignition mapping control ;Applications: * W202 C280 * W210 E280 * 1993–1994 W124 280 E, 300 E 2.8 * 1994–1996 W124 E 280 *1993–1998 W140 300 SE 2.8, S 280 *1995-1997 R129 SL 280 *1997–2004 W124 SsangYong Chairman H CM500S *2003–2006 Y200 SsangYong Rexton I RX 280

3.2 L M104.99x

For the , the compression ratio is the same 10.0:1 on all

W210 The Mercedes-Benz W210 was the internal designation for a range of executive cars manufactured by Mercedes-Benz and marketed under the Mercedes-Benz E-Class, E-Class model name in both sedan (car), sedan/saloon (1995–2002) and station wagon, st ...

, R129, and

but it did differ from 9.2:1 to 10.0:1 on

W124 The Mercedes-Benz W124 is a range of mid-size cars made by Daimler-Benz from 1984 to 1997. The range included numerous body configurations, and though collectively referred to as the W-124, official internal chassis designations varied by body st ...

(M104.992). ;Specifications *

@ 5500 rpm: *

@ 3750 rpm: * Bore and stroke: *

: 9.2:1 to 10.0:1 * Intake valves: * Exhaust valves *

: 1.7 kW electrical motor *

: electronic ignition system ;Applications: *

**1993–1994 W124 300 E, 320 E **1994–1996 W124 E 320 **1995–1997 W210 E320 **1991–1993 W140 300 SE, 300 SEL **1993–1999 W140 S320 **1994–1998 R129 SL 320 ** W463 G320 *

Roewe Roewe is a vehicle marque created by the Chinese automaker SAIC Motor in 2006, focuses in luxury cars. Roewe vehicles were initially based on technology acquired from defunct British carmaker MG Rover. SAIC was unable to purchase the rights t ...

**2011–2017 W5 **2008–2009 R95 *

**1997-2017

Chairman The chairperson, also chairman, chairwoman or chair, is the presiding officer of an organized group such as a board, committee, or deliberative assembly. The person holding the office, who is typically elected or appointed by members of the grou ...

**1996-2006

Korando The SsangYong Korando (Korean: 쌍용 코란도) is a mini SUV or compact crossover SUV built by the South Korean automobile manufacturer SsangYong from 1983 to 2006 and from 2010 onwards. The name Korando is a contraction of "Korea Can Do". The ...

**2007-2014 Kyron **1993–1999

Musso Munawar Musso (1897, in Kediri, East Java – Madiun, on 31 October 1948) was a leader of the Communist Party of Indonesia and one of the key figures in the 1948 Madiun affair. Biography Early life Musso was born Munawar Musso in 1897, Pagu, ...

**2001–2006 Rexton Y200 **2004–2013 Rodius *

Heuliez Heuliez was a French company that worked as a production and design unit for various automakers. It specialized in producing short series for niche markets, such as convertibles or station-wagons. The business activity ended on 31 October 2013. ...

**1996

Intruder Intruder may refer to: Film and television * ''The Intruder'' (1914 film), directed by Wallace Reid * ''The Intruder'' (1933 film), an American film by Albert Ray * ''The Intruder'' (1939 film), ''La intrusa'', an Argentine film by Julio Sa ...

* Status & Class **1999 OPAC Contender XG

AMG 3.4 (3.3 L)

There were 3.3 L conversions done to the 3.0 L M104.980 by AMG, prior to their formal 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 (

Mercedes-Benz W124 The Mercedes-Benz W124 is a range of mid-size cars made by Daimler-Benz from 1984 to 1997. The range included numerous body configurations, and though collectively referred to as the W-124, official internal chassis designations varied by body st ...

) vehicles, produced between 1988-1993. A few of these engines were originally installed in the SL 3.4 AMG. ;Specifications for AMG 3.4 (3.3 L) *

@ 6500 rpm: *

@ 4500 rpm: * Bore and stroke: *

system: pressure circulation * Oil capacity: * Coolant capacity: *

: 1.7 kW electrical motor *

: Bosch KE-Jetronic (CIS-E) injection

AMG 3.6 L M104.941/M104.992

There were 3.6 L conversions done to both the M103 and M104 by

Brabus Brabus GmbH (stylized in uppercase) is a German high-performance automotive aftermarket tuning company founded in 1977 in Bottrop (Ruhr area). Brabus specialises in Mercedes-Benz, Maybach and Smart vehicles, although in 2022 it also tuned two Por ...

, among others. AMG developed a M104 that was used in the W202 C36 AMG (

W202 Mercedes-Benz W202 is the internal designation for a compact sedan/saloon manufactured and marketed by Mercedes-Benz 1993–2000, as the first generation of the C-Class, now in its fifth generation. Replacing the 190 series/W201 in June 1993, ...

) from M104.941, the W124 E36 AMG (

) from M104.992, the E36 AMG (

), and the G36 AMG ( W463) 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 An engine control unit (ECU), also commonly called an engine control module (ECM), is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance. It does this by re ...

. 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 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 The SsangYong Motor Company ( ko, 쌍용자동차 주식회사) is a South Korea–based automobile manufacturer. It traces its origins back to a manufacturer established in 1954. The name SsangYong appeared in 1988, after its acquisition by the ...

(South Korean brand) made a 3.6 litre variant of M104 inline-six engine based on the 2.8 litre model, producing or on earlier versions, for its

model, a full-size luxury sedan. Chinese car

R95L which based on

SsangYong Chairman The SsangYong Chairman is a full-size luxury car that was manufactured by South Korean automaker SsangYong from 1997 to 2017. The original model was renamed Chairman H in 2008, with a new model introduced in the same year and designated Chairm ...

also uses 3.6 litre version of M104 engine. Last versions of German sportcar Isdera Spyder 036i after 1990 also uses 3.6 litre AMG variant of M104, producing 268 (200 kW; 272 PS) or 282 hp (210 kW; 286 PS). Mercedes M104 AMG 3

Turbo Conversions

Turbocharger In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

kits were offered for both the M103 and M104 engines by Hexa Garage, 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 (limited run of 75 conversions). Today turbocharger kits for M103-M104 engines are available from later tuners in Europe and Asia.

References

Notes

{{DEFAULTSORT:Mercedes-Benz M104 Engine M104 Straight-six engines Gasoline engines by model