Mercedes-Benz M271 engine#DE18ML .28271.9XX.29
{{Infobox automobile engine
| name = Mercedes-Benz M271
| image = Motor M271.jpg
| 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 = {{convert|1597|cc|L|1|abbr=on|order=flip}}
{{convert|1796|cc|L|1|abbr=on|order=flip}}
| bore = {{convert|82|mm|2|abbr=on}}
| stroke = {{convert|75.6|mm|2|abbr=on}}
{{convert|85|mm|2|abbr=on}}
| power = {{convert|122-204|PS|kW hp|0|abbr=on}}
| 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.
KE18 ML (271.9XX)
The KE18 ML is a {{convert|1796|cc|L|1|abbr=on|order=flip}} version. Bore and stroke is {{convert|82x85|mm|2|abbr=on}}. Output ranges from {{convert|122|PS|kW hp|0|abbr=on}} at 5200 rpm to {{convert|194|PS|kW hp|0|abbr=on}} 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.
- 2002 CLK 200 Kompressor (W209)
- 2002 C 180 Kompressor, C 200 Kompressor, C 230 Kompressor (W203)
- 2002 C 180 Kompressor SportCoupé, C 200 Kompressor SportCoupé (CL203)
- 2004–2006 C 160 SportCoupé (CL203){{cite web|url=https://mercedes-benz-publicarchive.com/marsClassic/en/instance/ko/C-160-Sportcoup--CL-203-E-18-ML-LR1-2005---2006.xhtml|website=mercedes-benz-publicarchive.com|title=C 160 Sportcoupé|accessdate=13 March 2024}}
- 2002 E 200 Kompressor (W211)
- 2004 E 200 NGT (bi-fuel - gasoline + natural gas) (W211)
- 2004 SLK 200 Kompressor (R171)
- 2007 C 180 Kompressor, C 200 Kompressor (W204)
- 2008 CLC 180 Kompressor, CLC 200 Kompressor (CL203)
DE18 ML (271.942)
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 {{convert|170|PS|kW hp|0|abbr=on}} at 5300 rpm. The production ceased in 2005.
- 2003 C 200 CGI SportCoupé (CL203)
- 2003 C 200 CGI (W203)
- 2003 CLK 200 CGI (C209)
KE16 ML (271.910)
The KE16 ML is a {{convert|1597|cc|L|1|abbr=on|order=flip}} version introduced in 2008. Bore and stroke is {{convert|82x75.6|mm|2|abbr=on}}. It shares the same features with the KE18ML version, like supercharger and multi-point fuel injection. Output ranges from {{convert|129|PS|kW hp|0|abbr=on}} at 5000 rpm to {{convert|156|PS|kW hp|0|abbr=on}} at 5200 rpm.
{{anchor|DE18LA}}
DE18 LA (M271Evo, 271.8XX)
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 {{convert|156|PS|kW hp|0|abbr=on}} at 5200 rpm to {{convert|204|PS|kW hp|0|abbr=on}} at 5500 rpm.
- 2009–2013 C 180 CGI, C 200 CGI, C 250 CGI (W204)
- 2009–2013 E 200 CGI, E 250 CGI (W212)
- 2010–2013 E 200 CGI (C207)
- 2009–2013 E 250 CGI (C207)
- 2011–2015 SLK 200, SLK 250 (R172)
Other uses
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.{{cite web|title=FORMULA 3 – ENGINES OF SUCCESS|url=https://www.hwaag.com/en/98-motorsports-c/326-formula-3-engines-of-success|website=HWA AG|accessdate=21 October 2024}}