Mercedes-Benz M103 engine
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Template:Infobox automobile 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 "heart shaped" to a "HEMI" spherical combustion chamber.
Specifications
The only mechanical differences from the M103 3.0 L to the M103 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.
| Model | 260 | 300 |
|---|---|---|
| Type | 103.940 | 103.980 |
| Production period | 1984–1997 | |
| Layout | ||
| Configuration | Straight-six | |
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| Cylinder bore | Script error: No such module "convert". | Script error: No such module "convert". |
| Piston stroke | Script error: No such module "convert". | |
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| Max. engine speed | 6,200/min | |
| Combustion | ||
| Principle | Internal combustion engine | |
| 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 | |
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| Cooling | water cooled engine cooling | |
| Coolant capacity | Script error: No such module "convert". | |
| Starter motor | 1.5 kW electrical motor · since Jan 1988: 1.7 kW | |
| Performance | ||
| Power w/ catalyst | Script error: No such module "convert". | Script error: No such module "convert". |
| @ engine speed | 5,800/min | 5,700/min |
| Torque w/ catalyst | Script error: No such module "convert". | Script error: No such module "convert". |
| @ engine speed | 4,600/min | 4,400/min |
| Power w/o catalyst | Script error: No such module "convert". | Script error: No such module "convert". |
| @ engine speed | 5,800/min | 5,700/min |
| Torque w/o catalyst | Script error: No such module "convert". | Script error: No such module "convert". |
| @ engine speed | 4,600/min | 4,400/min |
| Applications | ||
| W201 | 190 E 2.6 | |
| W124 | 260 E · 300 E 2.6 | 300 E |
| W126 | 260 SE | 300 SE · 300 SEL |
| R107 SL | 300 SL | |
| R129 SL | 300 SL | |
| W463 | 300 GE | |
| Isdera Spyder 036i | Isdera Spyder 036i | |
Data accuracy
The M 102 and M 103 engine family has 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.
| Model | 200 | 230 | 260 | 300 |
|---|---|---|---|---|
| Engine | M 102 | M 103 | ||
| Type | 102.92X–96X | 102.98X | 103.940 | 103.980 |
| Configuration | Straight-four | Straight-six | ||
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