Mercedes-Benz M166 engine

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

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.

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

References