Mercedes-Benz M166 engine

The M166 is a range of inline-four engines produced by Mercedes-Benz from 1997 to 2005, before it was succeeded by the M266 engine from 2004.

Mercedes-Benz M166
Overview
Manufacturer	Mercedes-Benz
Production	1997 – 2005
Layout
Configuration	Inline-four engine
Displacement	1.4 L (1,397 cc) 1.6 L (1,598 cc) 1.9 L (1,898 cc) 2.1 L (2,084 cc)
Cylinder bore	80 mm (3.15 in) (M166 E14, E16) 84 mm (3.31 in) (M166 E19, E21)
Piston stroke	69.5 mm (2.74 in) (1.4 L engines) 79.5 mm (3.13 in) (1.6 L engines) 85.6 mm (3.37 in) (1.9 L engines) 94 mm (3.70 in) (2.1 L engines)
Cylinder block material	Aluminium alloy
Cylinder head material	Aluminium alloy
Valvetrain	SOHC 2 valves x cyl.
Compression ratio	11:1 10.8:1 (1.9 L engines)
Combustion
Fuel system	Multipoint injection
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	60–103 kW (82–140 PS; 80–138 hp)
Torque output	130–205 N⋅m (96–151 lb⋅ft)
Chronology
Successor	Mercedes-Benz M266 engine

Design

The M166 is transversely mounted and features 2 valves per cylinder with multipoint injection. The engine is used in W168 A-Class models that feature the 'sandwich concept', where the engine is mounted at a 59-degree angle just behind the front axle. This allows for better weight distribution as well as increased safety, as the engine slides underneath the floorpan instead of into the cabin in the event of a head-on collision.

Models

Engine	Displacement	Power	Torque	Years
M166 E14	1.4 L; 85.3 cu in (1,397 cc)	60 kW (82 PS; 80 hp) at 5,000 rpm	130 N⋅m (96 lb⋅ft) at 3,750 rpm	1997–2004
M166 E16 R	1.6 L; 97.5 cu in (1,598 cc)		140 N⋅m (103 lb⋅ft) at 2,500 rpm	1997–2005
M166 E16		75 kW (102 PS; 101 hp) at 5,250 rpm	150 N⋅m (111 lb⋅ft) at 4,000 rpm
M166 E19	1.9 L; 115.8 cu in (1,898 cc)	92 kW (125 PS; 123 hp) at 5,500 rpm	180 N⋅m (133 lb⋅ft) at 4,000 rpm	1999–2005
M166 E21	2.1 L; 127.2 cu in (2,084 cc)	103 kW (140 PS; 138 hp) at 5,500 rpm	205 N⋅m (151 lb⋅ft) at 4,000 rpm	2002–2004

M166 E14

• 1997–2004 W168 A140

M166 E16

• 2001–2005 W639 Vito 1.6
• 1997–2004 W168 A160

M166 E19

• 1999–2004 W168 A190
• 2001–2005 W639 Vito 1.9
• 2001-2005 W414 Vaneo 1.9

M166 E21

• 2002–2004 W168 A210