The M166 is a range of

inline-four engines A straight-four engine (also called an inline-four) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The vast majority of automotive four-cylinder engines use a straight-four layout (with the e ...

produced by

Mercedes-Benz Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...

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 The floorpan is a large sheet metal stamping that often incorporates several smaller welded stampings to form the floor of a large vehicle and the position of its external and structural panels. In the case of monocoque designs, the floorpan ...

instead of into the cabin in the event of a

head-on collision A head-on collision is a traffic collision where the front ends of two vehicles such as cars, trains, ships or planes hit each other when travelling in opposite directions, as opposed to a side collision or rear-end collision. Rail transport ...

Models

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

References

{{reflist, 30em Mercedes-Benz engines Straight-four engines Gasoline engines by model