Mercedes-Benz M103 engine
Straight-6 cylinder engine from 1984
From Wikipedia, the free encyclopedia
The Mercedes-Benz M 103 is a 15-degree, straight-6 crossflow cylinder head automobile engine and was in production from 1984 to 1997.[1] It is a single overhead cam design with 2 valves per cylinder. The M 103 was replaced by the M 104 starting in 1989. This engine received several updates over the years of production, one of the updates was a change from a "heart shaped" to a "HEMI" spherical combustion chamber.
2,962 cc (180.8 cu in)
| Mercedes-Benz M 103 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 1984–1997 |
| Layout | |
| Configuration | Naturally aspirated Inline-6 |
| Displacement | 2,599 cc (158.6 cu in) 2,962 cc (180.8 cu in) |
| 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 per cylinder |
| 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 | M 110 & M 123 |
| Successor | M 104 |
Specifications
The only mechanical differences from the M 103 3.0 L to the M 103 2.6 L were the smaller bore and intake valves, with a slightly different airbox. The CIS-E components between 2.6 and 3.0 variants are all shared for any given model year with the exception of the ECU making engine swaps from 2.6 to 3.0 virtually bolt-in.
| Car model | 260 | 300 |
|---|---|---|
| Engine type | M 103 E 26 | M 103 E 30 |
| Production period | 1984–1997[1] | |
| Layout | ||
| Configuration | Straight-six[1] | |
| Bore pitch | 97 mm (3.819 in)[2] | |
| Cylinder bore | 82.9 mm (3.264 in)[2] | 88.5 mm (3.484 in)[2] |
| Piston stroke | 80.25 mm (3.159 in)[citation needed][3] | |
| Displacement | 2,599 cc (158.6 cu in)[4] | 2,962 cc (180.8 cu in)[3] |
| Max. engine speed | 6,200/min[citation needed] | |
| Combustion | ||
| Principle | Internal combustion engine[1] | |
| Mode of operation | Four-stroke | |
| Fuel type | gasoline | |
| Fuel octane | 95 RON/85 MON · 91 RON/81MON via plug-in jumper located in the engine compartment | |
| Fuel system | CIS-E (Continuous Injection System) | |
| Ignition system | electronic engine control unit | |
| Firing order | 1–5–3–6–2–4 | |
| Valvetrain | SOHC | |
| Valves per cylinder | 2 | |
| Configuration | V-shaped overhead crossflow | |
| Camshaft drive | simple roller-type chain | |
| Aspiration | Naturally aspirated | |
| Compression ratio | 9.2 : 1 | |
| Management | ||
| Lubrication | pressure circulation with wet sump | |
| Oil capacity | 6 L (1.6 US gal; 1.3 imp gal) | |
| Cooling | water cooled engine cooling | |
| Coolant capacity | 8.5 L (2.2 US gal; 1.9 imp gal) | |
| Starter motor | 1.5 kW (2.04 PS; 2.01 hp) electrical motor · since Jan 1988: 1.7 kW (2.31 PS; 2.28 hp) | |
| Performance | ||
| Power w/ catalyst | 118 kW (160 PS; 158 hp)[5] | 132 kW (179 PS; 177 hp)[a] |
| @ engine speed | 5,800/min | 5,700/min |
| Torque w/ catalyst | 220 N⋅m (162 lb⋅ft)[5] | 255 N⋅m (188 lb⋅ft)[5] |
| @ engine speed | 4,600/min | 4,400/min |
| Power w/o catalyst | 125 kW (170 PS; 168 hp)[5] | 140 kW (190 PS; 188 hp)[5] |
| @ engine speed | 5,800/min | 5,700/min |
| Torque w/o catalyst | 228 N⋅m (168 lb⋅ft)[5] | 260 N⋅m (192 lb⋅ft)[5] |
| @ engine speed | 4,600/min | 4,400/min |
| Applications | ||
| W 201 | 190 E 2.6 | |
| W 124 | 260 E · 300 E 2.6 | 300 E |
| W 126 | 260 SE | 300 SE · 300 SEL |
| R 107 | 300 SL | |
| R 129 | 300 SL | |
| W 463 | 300 GE | |
| Isdera | Isdera Spyder 036i | |
Data accuracy
The M 102 and M 103 engine family has with the M 104 E 30 a common piston stroke of 80.25 mm. As only one decimal place is usually given, a large number of publications are in circulation with the incomplete specification of 80.2 mm. This applies in particular to more recent publications after production was discontinued. As a result, the inaccurate figures of 2,597 cc instead of the actual 2,599 cc for the 2.6 l engine and 2,960 cc instead of 2,962 cc for the 3.0 l engine have become established.
There is no evidence anywhere that there are two crankshafts with different strokes.[a]
| Car model | 200 | 230 | 260 | 300 |
|---|---|---|---|---|
| Engine | M 102 | M 103 · M 104 | ||
| Engine type | M 102 V 20 M 102 E 20 |
M 102 E 23 M 102 E 23/2 |
M 103 E 26 | M 103 E 30 M 104 E 30 |
| Configuration | Straight-four | Straight-six | ||
| Cylinder bore | 89 mm (3.504 in) | 95.5 mm (3.760 in) | 82.9 mm (3.264 in) | 88.5 mm (3.484 in) |
| Complete piston stroke | 80.25 mm (3.159 in) | |||
| Accurate displacement | 1,997 cc (121.9 cu in) 1,996.99 cc (121.864 cu in) |
2,299 cc (140.3 cu in) 2,299.33 cc (140.314 cu in) |
2,599 cc (158.6 cu in) 2,598.93 cc (158.596 cu in) |
2,962 cc (180.8 cu in) 2,961.92 cc (180.747 cu in) |
| Incomplete piston stroke | 80.2 mm (3.157 in) | |||
| Inaccurate displacement | 1,996 cc (121.8 cu in) 1,995.74 cc (121.788 cu in) |
2,298 cc (140.2 cu in) 2,297.90 cc (140.226 cu in) |
2,597 cc (158.5 cu in) 2,597.31 cc (158.498 cu in) |
2,960 cc (180.6 cu in) 2,960.07 cc (180.635 cu in) |
| ||||