Mercedes-Benz M120 engine

The Mercedes-Benz M120 engine is a high-performance automobile piston V12 engine family used in the 1990s and 2000s in Mercedes' flagship models.

Mercedes-Benz M120 engine
Overview
Manufacturer	Mercedes-Benz
Layout
Configuration	60° V12
Displacement	6.0 L (5,987 cc) 7.3 L (7,291 cc)
Cylinder bore	89 mm (3.5 in) 91.5 mm (3.60 in)
Piston stroke	80.2 mm (3.16 in) 92.4 mm (3.64 in)
Block material	Aluminium
Head material	Aluminium
Valvetrain	DOHC 4 valves x cyl.
Combustion
Fuel system	Sequential fuel injection
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	394–1,230 PS (290–905 kW; 389–1,213 hp)
Chronology
Successor	M137

The M120 family is built in Stuttgart, Germany. It has an aluminium engine block lined with silicon/aluminium. The aluminium DOHC cylinder heads are 4 valves per cylinder designs. It uses sequential fuel injection (SFI) and features forged steel connecting rods.

The M120 was eventually replaced by the smaller, lesser-powered, short-lived, SOHC, three valves per cylinder, 5.8L, M137 V12 engine. Mercedes ceased production of the M120 because of new emission rules.

M120 6.0 48v

M120 S600 (1994), 400 PS (294 kW; 395 hp)

This engine developed 394–408 PS (290–300 kW; 389–402 hp) and 420–428 lb⋅ft (569–580 N⋅m) of torque for the 6.0 L version. In 1992 only the M120 engine was offered in North America in 402 hp (300 kW; 408 PS) format and from 1991-92 408 PS (300 kW; 402 hp) In Europe. All other years 1993–1999 have the 394 PS (290 kW; 389 hp) version.

Applications:

• 1992–1999 600SEC/S600 Coupe/CL600
• 1991–1998 600SE/600SEL/S600
• 1992–2001 600SL/SL600

Larger displacement M120s

Main article: Mercedes-Benz M297 engine

In 1997, the FIA GT Championship race car Mercedes-Benz CLK GTR was fitted with the M297 engine, derived from the M120. The 25 road cars, required by the FIA rules and delivered in 1999, had their engine enlarged to 6.9 L. There was also a 7.3 L version producing 525 PS (386 kW; 518 hp) developed by AMG which was also used in the SL73 AMG. The 7.3 L M297 engine was also featured in the AMG-built, S73 T Kombi, a custom-built, W140, S-Class wagon built for the Sultan of Brunei. Eighteen units were produced, ten of which went to the Sultan.[1]

A 7.0 L M120 version was also used in the SL70 AMG, and produced 496 PS (365 kW; 489 hp).

Pagani Zonda

The Pagani Zonda[2] has used 3 different capacity, Mercedes-AMG tuned, versions of the M120 engine starting with the untuned 6.0 L for the original Zonda C12 to a 7.0 L (M297) version for the C12 S and Zonda GR, then to the 7.3 L for the Zonda C12s 7.3, Zonda F, Zonda Cinque and the Zonda Tricolore, and back to the 6.0 L for the Zonda R and the Zonda Revolucion. The bore and stroke is 91.5 mm × 92.4 mm (3.60 in × 3.64 in).[3]

Applications:

AMG engine display at the Pagani factory

Year	Model	Displacement	Power output
1999	Pagani Zonda C12	6.0 L	400 hp (298 kW; 406 PS)[4]
1999	Pagani Zonda C12-S	7.0 L	540 hp (403 kW; 547 PS)[5]
2002	Pagani Zonda C12-S 7.3	7.3 L	547 hp (408 kW; 555 PS)[6]
2003	Pagani Zonda GR	7.0 L	590 hp (440 kW; 598 PS)
2005	Pagani Zonda F	7.3 L	602 hp (449 kW; 610 PS)[7]
2009	Pagani Zonda Cinque		678 hp (506 kW; 687 PS)[8]
2010	Pagani Zonda Tricolore		670 hp (500 kW; 679 PS)[9]
2009	Pagani Zonda R	6.0 L	740 hp (552 kW; 750 PS)[10]
2012	Pagani Zonda Revolución		789 hp (588 kW; 800 PS)[11]

References

1. “AMG Gmbh Mercedes-Benz S73 T Kombi: 7.3L V12 Battleship Archived 2011-04-17 at the Wayback Machine,” VelocityResource.com January 26, 2011. (Retrieved 2011-02-02.)
2. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
3. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
4. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
5. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
6. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
7. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
8. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
9. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
10. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)
11. "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-27.CS1 maint: archived copy as title (link)

See also

• List of Mercedes-Benz engines