Mercedes-Benz M22 engine

{{Infobox automobile engine

|image =

|name = Mercedes-Benz M22

|manufacturer = Mercedes-Benz

|production = 1933-1934

|configuration = Straight-eight

|bore = {{convert|78-80|mm|in|1|lk=on|abbr=on}}

|stroke = {{convert|100|mm|in|1|lk=on|abbr=on}}

|displacement = {{convert|3.8-4.0|L|cuin|0|lk=on|abbr=on}}

|valvetrain = 16-valve, DOHC, two-valves per cylinder

|power = {{convert|89-143|hp|kW|0|lk=on|abbr=on}}

|torque = {{convert|146-209|lb.ft|N.m|0|lk=on|abbr=on}}

|supercharger = Naturally aspirated (380)
Roots-type supercharger (380 K)

|fuelsystem = Carburetor

|fueltype = Gasoline

|compression = 5.54:1-6.0:1{{Cite web|url=https://sportlichleicht.com/info/engines/m22/|title=Mercedes-Benz M22 Engine|website=Sportlich-Leicht}}

|oilsystem = Dry sump

|weight =

|predecessor= Mercedes-Benz M19 engine

|successor= Mercedes-Benz M24 engine

}}

The Mercedes-Benz M22 engine is a naturally-aspirated and supercharged, 3.8-liter and 4.0-liter, straight-8 engine, designed, developed and produced by Mercedes-Benz; between 1933 and 1934.{{Cite web|url=https://www.conceptcarz.com/s14323/mercedes-benz-380k.aspx|title=1934 MercedesBenz 380K technical and mechanical specifications|website=conceptcarz.com}}