| Mercedes-Benz M271 | |
| Manufacturer: | Mercedes-Benz |
| Production: | 2002–2015 |
| Configuration: | Straight-4 |
| Supercharger: | In some versions and intercooled |
| Turbocharger: | In DE18LA (M271Evo, 271.8XX) |
| Block: | Cast aluminium |
| Head: | Aluminium |
| Valvetrain: | DOHC 4 valves x cyl. and VVT |
| Fueltype: | Gasoline |
| Fuelsystem: | Sequential fuel injection Direct injection |
| Coolingsystem: | Water cooled |
| Displacement: | 1597cc 1796cc |
| Bore: | 82mm |
| Stroke: | 75.6mm 85mm |
| Power: | NaN0NaN0 |
| Predecessor: | Mercedes-Benz M111 engine |
| Successor: | Mercedes-Benz M274 engine |
The Mercedes-Benz M271 engine is a straight-4 automobile piston engine family used in the 2000s (decade).
All M271 engines are built in Untertürkheim, Germany. The family has a cast aluminium engine block and aluminium DOHC cylinder heads with 4 valves per cylinder and variable valve timing and a coil-on-plug ignition system.
The KE18 ML is a 1796cc version. Bore and stroke is NaNmm. Output ranges from 1220NaN0 at 5200 rpm to 1940NaN0 at 5800 rpm.
It uses sequential fuel injection, is supercharged and intercooled, and features fracture-split forged steel connecting rods.A version running on natural gas was introduced in the German market in 2002.
Applications:[1]
This engine had the same dimensions as E18 ML and almost the same features including a supercharger, but used CGI (Stratified Charged Gasoline Injection) gasoline direct injection. It has been produced since 2003 in only one version, with an output of 1700NaN0 at 5300 rpm. The production ceased in 2005.
Applications:[3]
The KE16 ML is a 1597cc version introduced in 2008. Bore and stroke is NaNmm. It shares the same features with the KE18ML version, like supercharger and multi-point fuel injection. Output ranges from 1290NaN0 at 5000 rpm to 1560NaN0 at 5200 rpm.
Applications:[4]
This is the last version of M271 engine family. Dimensions are the same as E18 ML and DE18 ML, but the supercharger has been replaced with a turbocharger; like the DE18 ML it uses the CGI (Stratified Charged Gasoline Injection) gasoline direct injection. Output ranges from 1560NaN0 at 5200 rpm to 2040NaN0 at 5500 rpm.
Applications:[5]
The engine in 2.0-litre naturally aspirated form is used by German automotive company HWA Team as the basis for a Mercedes-Benz motor racing engine and has been the engine used widely in Formula 3 motor racing powering championship winning drivers across Europe and further afield.[6]