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Mercedes-Benz M112 specs: 2.6L (158 ci) 6-cylinder, 89.9 x 68.2 mm (3.5394 x 2.6850 in) bore and stroke, 10.5:1 compression. Built 2001–2005.
The Mercedes-Benz M112 is oversquare — the 3.5394" bore exceeds the 2.685" stroke by 31.8% — a layout that favors airflow and RPM over leverage at the crank. The 2.685" stroke does not reach 4,000 ft/min of mean piston speed until about 8,950 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 26.3 ci (432 cc).
10.5:1 is in the range that usually runs on pump premium.
5 factory variants share these dimensions across 2001–2005.
| Displacement | 158 ci / 2.6 L |
|---|---|
| Bore | 3.5394" |
| Stroke | 2.685" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.318 |
| Fuel type | gas |
|---|---|
| Years | 2001–2005 |
| Bore/stroke character | 1.318 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,685 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.3 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2001 | — | M112 |
| 2002 | — | M112 |
| 2003 | — | M112 |
| 2004 | — | M112 |
| 2005 | — | M112 |
1 factory vehicle, 2001–2005. Each year opens that model's engine table.