Mercedes-Benz M118 engine
{{Infobox automobile engine
| name = Mercedes-Benz M118
| image = Mercedes M118 engine.png
| manufacturer = Audi
| aka = {{ubl
|H engine
}}
| production = September 1965 – July 1972
| predecessor =
| successor = Volkswagen EA827 engine
| configuration = Inline 4
| displacement = {{ubl
|{{convert|1496|cc|L|1|order=flip|abbr=on}}
|{{convert|1697|cc|L|1|order=flip|abbr=on}}
|{{convert|1760|cc|L|1|order=flip|abbr=on}}
}}
| bore = {{convert|80|mm|2|abbr=on}}
| stroke = {{convert|84.4|mm|2|abbr=on}}
| block = Cast iron
| head = Cast iron
| valvetrain = OHV
| compression = {{ubl
|9.1:1
|11.2:1 (1.7 L engines)
|10.6:1 (1.8 L engines)
}}
| supercharger =
| turbocharger =
| fuelsystem = Carburetor
| management =
| fueltype = Gasoline
| oilsystem =
| coolingsystem = Water cooled
| power = {{convert|40-66|kW|PS hp|0|abbr=on}}
| specpower =
| torque = {{convert|113-147|Nm|lbft|0|abbr=on}}
| length =
| width =
| height =
| diameter =
| weight =
}}
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.{{Cite news|url=https://jalopnik.com/how-this-gorgeous-mercedes-prototype-made-modern-volksw-1787505336|title=How This Gorgeous Mercedes Prototype Made Modern Volkswagen Possible|last=Torchinsky|first=Jason|work=Jalopnik|access-date=2018-08-28|language=en-US}} It was first used by Audi in the F103, after Daimler AG sold the company to Volkswagen.{{Cite web|url=https://www.hagertyinsurance.co.uk/price-guide/1965-Audi-72|title=1965 Audi 72 {{!}} Hagerty – Classic Car Price Guide|website=www.hagertyinsurance.co.uk|language=en|access-date=2018-08-28}} 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.{{Cite news|url=https://www.roadandtrack.com/car-culture/classic-cars/a19754692/sixty-years-ago-daimler-benz-bought-auto-union/|title=Sixty Years Ago, Daimler-Benz Bought Auto Union|date=2018-04-12|work=Road & Track|access-date=2018-08-28|language=en-US}} It was later revised several times with increased displacements and reduced compression ratios for improved reliability.{{cite book|title=Deutsche Autos 1945–1990, volume 4|last=Oswald|first=Werner|publisher=Motorbuch Verlag|year=2001|isbn=3-613-02131-5|page=264|language=German}} The success of the M118 allowed Audi to expand into more upscale market segments.{{Cite news|url=https://www.motor1.com/news/78190/mercedes-made-audi-into-what-it-is-today/|title=Mercedes Made Audi Into What It Is Today|work=Motor1.com|access-date=2018-08-28|language=en}}
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.{{Citation needed|date=January 2024}}
Engines
| class="wikitable sortable" style="text-align: center;"
!Displacement !Power !Torque !Years |
| {{convert|1496|cc|L cuin|1|abbr=on|disp=flip}}
|{{convert|40|kW|PS hp|0|abbr=on}} |{{convert|113|Nm|lbft|0|abbr=on}} |1968–1972 |
| rowspan="3" |{{convert|1697|cc|L cuin|1|abbr=on|disp=flip}}
|{{convert|53|kW|PS hp|0|abbr=on}} |{{convert|127|Nm|lbft|0|abbr=on}} |1965–1968 |
| {{convert|55|kW|PS hp|0|abbr=on}} at 5,000 rpm |{{convert|127|Nm|lbft|0|abbr=on}} |1968–1972 |
| {{convert|59|kW|PS hp|0|abbr=on}} at 5,000 rpm |{{convert|132|Nm|lbft|0|abbr=on}} |1966–1968 |
| {{convert|1760|cc|L cuin|1|abbr=on|disp=flip}}
|{{convert|66|kW|PS hp|0|abbr=on}} |{{convert|147|Nm|lbft|0|abbr=on}} |1966–1971 |
= M118 =
40 kW version
- 1968–1972 Audi 60{{Cite news|url=https://mercedesblog.com/historic-curiosities-mercedes-created-the-audi-we-know-today/|title=History's irony: Mercedes created the Audi we know today - MercedesBlog|date=2016-05-04|work=MercedesBlog|access-date=2018-08-28|language=en-US}}
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