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Mercedes M271 Engine 1.8L Review

M271 Engine 1.8L

The inline four-cylinder engine series M271 appeared in 2002. The new generation engine has utterly new cylinder block, which cats from aluminum alloy with cast iron sleeves. There is a balancing mechanism inside the cylinder block. The M271 cylinder head is also made from aluminum; it has two camshafts, four valves per cylinder and hydraulic lifters. The engine has variable valve timing system on both camshafts.

The M271 1.8L engine has two types of cylinder heads for KE and DE versions (indirect injection and direct injection fuel system). Also, KE and DE pistons are different. The diameter of the intake valve is 30.5 mm, exhaust - 27 mm. Connecting rods are from M111 EVO. The engine has a timing chain and small supercharger Eaton M65 (Kompressor).

In 2009, the M271 series was upgraded, and the main feature of these engines became the turbocharger IHI Al 0065/0066 instead of the supercharger. Also, the engine control system was changed to Siemens SIM4 LDE.

The broad power range of M271 1.8 liter engine allowed to replace all M111 series engines. M271 series has 1.6-liter engine version also. The next four-cylinder family the M274/M270 appeared in 2011 and started the replacement of M271 series actively.

Engine Specs

Manufacturer
Stuttgart-Untertürkheim Plant
Production years
2002-present day
Cylinder block material
Aluminum
Cylinder head material
Aluminum
Fuel type
Gasoline
Fuel system
Fuel injection
Configuration
Inline
Number of cylinders
4
Valves per cylinder
4
Valvetrain layout
DOHC
Bore, mm
82.0
Stroke, mm
85.0
Displacement, cc
1796
Type of internal combustion engine
Four-stroke, turbocharged and supercharged versions
Compression Ratio
9.5-10.5
Power, hp
122-192/5200-5800
Torque, lb ft
140-192/1500-3500
Engine weight
Firing order
1-3-4-2
Engine oil weight
0W-30, 0W-40, 5W-30, 5W-40
Engine oil capacity, liter
5.5
Oil change interval, mile
6,000
Applications
C 180 Kompressor W203, C 180 Kompressor W204, C 200 Kompressor W203, C 200 Kompressor W204, C 230 Kompressor W203, C 250 W204, CLK 200 Kompressor C209, E 200 Kompressor W211, E 200 W212, E 250 W212, E 200 Coupe C207, E 250 Coupe C207, SLK 200 Kompressor R171, SLK 200 R172, SLK 250 R172, Sprinter W906, CLC 180 Kompressor CL203, CLC 200 Kompressor CL203

M271 KE/DE 18 1.8l Engine Problems and Reliability

1. Power loss. That is one of the most common problems with the M271, which caused by soot on valve stems.
2. Engine noise during fired-up. The engine had an unreliable single-stand timing chain and stretched chain produces a lot of noise.

Modifications

M271.820 (2009 - present day) - EVO modification. Compression ratio is 9.3, power - 184 hp, torque - 199 ft lb. This motor was designed for Mercedes-Benz C 200 BlueEFFICIENCY W204, SLK 200 BlueEFFICIENCY R172, E 200 BlueEFFICIENCY W212, E 200 Coupe BlueEFFICIENCY C207.
M271.860 (2009 - present day) - another EVO modification with 202 hp and 228 ft lb of torque. This motor is for Mercedes-Benz C 250 BlueEFFICIENCY W204, SLK 250 BlueEFFICIENCY R172, E 250 BlueEFFICIENCY W212, E 250 Coupe BlueEFFICIENCY C207.

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