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

Mercedes-Benz M118
Overview
Manufacturer	Audi
Also called	H engine M118 Mexico[1]
Production	September 1965 – July 1972
Layout
Configuration	Inline 4
Displacement	1.5 L (1,496 cc) 1.7 L (1,697 cc) 1.8 L (1,760 cc)
Cylinder bore	80 mm (3.15 in)
Piston stroke	84.4 mm (3.32 in)
Block material	Cast iron
Head material	Cast iron
Valvetrain	OHV
Compression ratio	9.1:1 11.2:1 (1.7 L engines) 10.6:1 (1.8 L engines)
Combustion
Fuel system	Carburetor
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	40–66 kW (54–90 PS; 54–89 hp)
Torque output	113–147 N⋅m (83–108 lb⋅ft)
Chronology
Successor	Volkswagen 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 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]

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

• 1966–1968 Audi 80

66 kW version

• 1966–1971 Audi 90

References

На других языках

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- [en] Mercedes-Benz M118 engine

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[it] Mercedes-Benz M118

La sigla M118 identifica un motore a scoppio progettato all'inizio degli anni '60 dalla Casa automobilistica tedesca Mercedes-Benz e prodotto su licenza dal 1965 al 1972 dalla Audi.

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