Mercedes-Benz M118 engine

The M118 is a four-stroke inline-four engine produced from 1965 to 1972.

Mercedes-Benz M118
Overview
ManufacturerAudi
Also called
  • H engine
  • M118 Mexico[1]
ProductionSeptember 1965 – July 1972
Layout
ConfigurationInline 4
Displacement
  • 1.5 L (1,496 cc)
  • 1.7 L (1,697 cc)
  • 1.8 L (1,760 cc)
Cylinder bore80 mm (3.15 in)
Piston stroke84.4 mm (3.32 in)
Block materialCast iron
Head materialCast iron
ValvetrainSOHC
Compression ratio
  • 9.1:1
  • 11.2:1 (1.7 L engines)
  • 10.6:1 (1.8 L engines)
Combustion
Fuel systemCarburetor
Fuel typeGasoline
Cooling systemWater cooled
Output
Power output40–66 kW (54–90 PS; 54–89 hp)
Torque output113–147 N⋅m (83–108 lb⋅ft)
Chronology
SuccessorVolkswagen EA827 engine

Design

The M118 was originally developed by Mercedes-Benz for the mass-produced vehicle segment.[2] It was first used by Audi in the F103, after Daimler AG sold the company to Volkswagen.[3] The engine replaces the previous two-stroke engines, and features a water-cooled Solex carburetor that allowed for smoother operation and enhanced efficiency.[4] It was later revised several times with increased displacements and reduced compression ratios for improved reliability.[5] The success of the M118 allowed Audi to expand into more upscale market segments.[6]

Engines
Displacement Power Torque Years
1.5 L; 91.3 cu in (1,496 cc) 40 kW (54 PS; 54 hp)
at 4,750 rpm		 113 N⋅m (83 lb⋅ft)
at 2,600 rpm		 1968–1972
1.7 L; 103.6 cu in (1,697 cc) 53 kW (72 PS; 71 hp)
at 5,000 rpm		 127 N⋅m (94 lb⋅ft)
at 2,800 rpm		 1965–1968
55 kW (75 PS; 74 hp)
at 5,000 rpm		 127 N⋅m (94 lb⋅ft)
at 3,000 rpm		 1968–1972
59 kW (80 PS; 79 hp)
at 5,000 rpm		 132 N⋅m (97 lb⋅ft)
at 5,000 rpm		 1966–1968
1.8 L; 107.4 cu in (1,760 cc) 66 kW (90 PS; 89 hp)
at 5,300 rpm		 147 N⋅m (108 lb⋅ft)
at 3,000 rpm		 1966–1971

M118

40 kW version

  • 1968–1972 Audi 60[7]

53 kW version

  • 1965–1968 Audi 72

55 kW version

  • 1968–1972 Audi 75

59 kW version

66 kW version

  • 1966–1971 Audi 90

References
  1. Patrascu, Daniel (2018-04-12). "Mercedes-Benz Remembers It Helped Create Audi of Today". autoevolution. Retrieved 2018-08-28.
  2. Torchinsky, Jason. "How This Gorgeous Mercedes Prototype Made Modern Volkswagen Possible". Jalopnik. Retrieved 2018-08-28.
  3. "1965 Audi 72 | Hagerty – Classic Car Price Guide". www.hagertyinsurance.co.uk. Retrieved 2018-08-28.
  4. "Sixty Years Ago, Daimler-Benz Bought Auto Union". Road & Track. 2018-04-12. Retrieved 2018-08-28.
  5. Oswald, Werner (2001). Deutsche Autos 1945–1990, volume 4 (in German). Motorbuch Verlag. p. 264. ISBN 3-613-02131-5.
  6. "Mercedes Made Audi Into What It Is Today". Motor1.com. Retrieved 2018-08-28.
  7. "History's irony: Mercedes created the Audi we know today - MercedesBlog". MercedesBlog. 2016-05-04. Retrieved 2018-08-28.
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