Mercedes-Benz M103 engine

Mercedes-Benz M103 engine
Overview
ManufacturerMercedes-Benz
Production1984–1997
Layout
ConfigurationNaturally aspirated Straight-6
Displacement158.6 cu in (2,599 cc)
180.8 cu in (2,962 cc)
Cylinder bore82.9 mm (3.264 in)
88.5 mm (3.484 in)
Piston stroke80.25 mm (3.159 in)
ValvetrainSOHC / 2 valves x cyl.
Compression ratio9.2:1
RPM range
Max. engine speed6200
Combustion
Fuel systemContinuous Injection System - Electronic
Fuel typeGasoline
Oil systemWet sump
Cooling systemWater cooled
Output
Power output118–140 kW (160–190 PS; 158–188 hp)
Torque output220–260 N⋅m (162–192 lb⋅ft)
Chronology
PredecessorM110 & M123
SuccessorM104
An egg being cooked on a 3.0 L M103 engine

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.