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
ManufacturerMercedes-Benz
Production1997 – 2005
Layout
ConfigurationInline-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)
Block materialAluminium alloy
Head materialAluminium alloy
ValvetrainSOHC 2 valves x cyl.
Compression ratio
  • 11:1
  • 10.8:1 (1.9 L engines)
Combustion
Fuel systemMultipoint injection
Fuel typeGasoline
Cooling systemWater cooled
Output
Power output60–103 kW (82–140 PS; 80–138 hp)
Torque output130–205 N⋅m (96–151 lb⋅ft)
Chronology
SuccessorMercedes-Benz M266 engine

Design

The M166 is transversely mounted and features 2 valves per cylinder with multipoint injection.[1] 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.[2] 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.[3]

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

M166 E16

M166 E19


M166 E21
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References
  1. "Mercedes-Benz M166 and M266 engines". australiancar.reviews. Retrieved 2018-07-06.
  2. Popa, Bogdan (2009-04-23). "How Mercedes' Sandwich Concept Works". autoevolution. Retrieved 2018-07-06.
  3. "Mercedes cuts sandwich but B-class still tempts appetite". The National Business Review. 2012-04-14. Retrieved 2018-07-06.
  4. "AustralianCar.Reviews: #1 for Reviews and Used Car Valuations". australiancar.reviews. Retrieved 2018-07-06.
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