Mercedes-Benz M271 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 1796 cc version. Bore and stroke is 82x85 mm. Output ranges from 122 PS at 5200 rpm to 194 PS 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:
 * 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)
 * 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 170 PS at 5300 rpm. The production ceased in 2005.

Applications:
 * 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 1597 cc version introduced in 2008. Bore and stroke is 82x75.6 mm. It shares the same features with the KE18ML version, like supercharger and multi-point fuel injection. Output ranges from 129 PS at 5000 rpm to 156 PS at 5200 rpm.

Applications:
 * 2008 CLC 160 BlueEFFICIENCY (CL203)
 * 2008 C 180 Kompressor (W204)

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 156 PS at 5200 rpm to 204 PS at 5500 rpm.

Applications:
 * 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.