Mercedes-Benz M118 engine

Mercedes-Benz M118
Overview
Manufacturer	Audi
Also called	H engine M118 Mexico
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)
Cylinder block material	Cast iron
Cylinder 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

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. It was first used by Audi in the F103, after Daimler AG sold the company to Volkswagen. 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. It was later revised several times with increased displacements and reduced compression ratios for improved reliability. The success of the M118 allowed Audi to expand into more upscale market segments. 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

• 1968–1972 Audi 60

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