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 DisplacementPowerTorqueYears at 4,750 rpm at 2,600 rpm1968–1972 at 5,000 rpm at 2,800 rpm1965–1968 at 5,000 rpm at 3,000 rpm1968–1972 at 5,000 rpm at 5,000 rpm1966–1968 at 5,300 rpm at 3,000 rpm1966–1971
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
References