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)
Cylinder block materialCast iron
Cylinder head materialCast iron
ValvetrainOHV
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

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

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 replaced the previous two-stroke engines, featured a Solex carburetor, and utilised a swirling effect in the intake ducts 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] On the basis of OHV 4 cylinder M118 engine, Volkswagen engineers created modified 2.0 SOHC unit called VW EA831, that was later used in Audi 100 (C2, 1976–1982), Volkswagen LT and eventually in the Porsche 924.

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

53 kW version

55 kW version

59 kW version

66 kW version

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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