Mercedes-Benz M271 engine

The Mercedes-Benz M271 engine is a straight-4 automobile piston engine family used in the 2000s (decade).

Mercedes-Benz M271
Overview
Manufacturer	Mercedes-Benz
Production	2002–2015
Layout
Configuration	Straight-4
Displacement	1.6 L (1,597 cc) 1.8 L (1,796 cc)
Cylinder bore	82 mm (3.23 in)
Piston stroke	75.6 mm (2.98 in) 85 mm (3.35 in)
Cylinder block material	Cast aluminium
Cylinder head material	Aluminium
Valvetrain	DOHC 4 valves x cyl. and VVT
Combustion
Supercharger	In some versions and intercooled
Turbocharger	In DE18LA (M271Evo, 271.8XX)
Fuel system	Sequential fuel injection Direct injection
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	122–204 PS (90–150 kW; 120–201 hp)
Chronology
Predecessor	Mercedes-Benz M111 engine
Successor	Mercedes-Benz M274 engine

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 1.8 L (1,796 cc) version. Bore and stroke is 82 mm × 85 mm (3.23 in × 3.35 in). Output ranges from 122 PS (90 kW; 120 hp) at 5200 rpm to 194 PS (143 kW; 191 hp) 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 (125 kW; 168 hp) 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 1.6 L (1,597 cc) version introduced in 2008. Bore and stroke is 82 mm × 75.6 mm (3.23 in × 2.98 in). It shares the same features with the KE18ML version, like supercharger and multi-point fuel injection. Output ranges from 129 PS (95 kW; 127 hp) at 5000 rpm to 156 PS (115 kW; 154 hp) 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 (115 kW; 154 hp) at 5200 rpm to 204 PS (150 kW; 201 hp) 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.

See also

• List of Mercedes-Benz engines