Mercedes-Benz OM660 engine

The OM660 is a 0.8-litre turbocharged straight-three Diesel engine produced by Mercedes-Benz for use in Smart vehicles, from 1999 to 2014.

Mercedes-Benz OM660
Overview
Manufacturer	Mercedes-Benz
Production	1998 – 2015
Layout
Configuration	Straight-three engine
Displacement	0.8 L (799 cc)
Cylinder bore	65.5 mm (2.58 in)
Piston stroke	79 mm (3.11 in)
Cylinder block material	Aluminium alloy
Cylinder head material	Aluminium alloy
Valvetrain	SOHC 2 valves x cyl.
Compression ratio	18.5:1
Combustion
Turbocharger	Single-turbo
Fuel system	Direct injection Common rail
Fuel type	Diesel
Cooling system	Water cooled
Output
Power output	30–40 kW (41–54 PS; 40–54 hp)
Torque output	100–130 N⋅m (74–96 lb⋅ft)

Design

The OM660 features a single-overhead camshaft with two valves per cylinder and an aluminium alloy cylinder block and head. It is turbocharged and features an exhaust gas recirculation system. The OM660 was updated in 2007 receiving increased performance due to a new common rail fuel system with increased boost pressure,^[1] and again in 2011 featuring further performance and efficiency improvements.^[2]

Models

Engine	Power	Torque	Years
OM660	30 kW (41 PS; 40 hp) @ 4,200 rpm	100 N⋅m (74 lb⋅ft) @ 1,800 rpm	1999–2006
	33 kW (45 PS; 44 hp) @ 3,800 rpm	110 N⋅m (81 lb⋅ft) @ 2,000–2,500 rpm	2007–2009
	40 kW (54 PS; 54 hp) @ 3,800 rpm	130 N⋅m (96 lb⋅ft) @ 2,100 rpm	2009–2014

OM660 (30 kW version)

• 1999–2006 W450 Smart Fortwo

OM660 (33 kW version)

• 2007–2009 W451 Smart Fortwo

OM660 (40 kW version)

• 2009–2014 W451 Smart Fortwo