Mercedes-Benz M103 engine

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Mercedes-Benz M103 engine
Overview
Manufacturer	Mercedes-Benz
Production	1984–1997
Layout
Configuration	Naturally aspirated Straight-6
Displacement	158.6 cu in (2,599 cc) 180.8 cu in (2,962 cc)
Cylinder bore	82.9 mm (3.264 in) 88.5 mm (3.484 in)
Piston stroke	80.25 mm (3.159 in)
Valvetrain	SOHC / 2 valves x cyl.
Compression ratio	9.2:1
RPM range
Max. engine speed	6200
Combustion
Fuel system	Continuous Injection System - Electronic
Fuel type	Gasoline
Oil system	Wet sump
Cooling system	Water cooled
Output
Power output	118–140 kW (160–190 PS; 158–188 hp)
Torque output	220–260 N⋅m (162–192 lb⋅ft)
Chronology
Predecessor	M110 & M123
Successor	M104

The Mercedes-Benz M103 is a straight-6 15 degrees, crossflow cylinder head with an inclination to the right, automobile engine produced from 1984 to 1997. It is a single overhead cam design with 2 valves per cylinder. The M103 was replaced by the M104 starting in 1989. This engine received several updates over the years of production, one of the updates was a change from a spherical combustion chamber to a "heart shaped" combustion chamber.