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Mercedes-Benz M111 specs: 2.3L (140 ci) 4-cylinder, 90.9 x 88.4 mm (3.5787 x 3.4803 in) bore and stroke. Built 1997–2002. Used in the Mercedes-Benz C-Class.
The Mercedes-Benz M111 is close to square: 3.5787" bore against 3.4803" stroke, within 2.8%, which splits the difference between a high-revving layout and a torque layout. The 3.4803" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 35.0 ci (574 cc).
5 factory variants share these dimensions across 1997–2002.
| Displacement | 140 ci / 2.3 L |
|---|---|
| Bore | 3.5787" |
| Stroke | 3.4803" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.8–10.4:1 (published figures vary) |
| Bore/stroke ratio | 1.028 |
| Fuel type | gas |
|---|---|
| Years | 1997–2002 |
| Bore/stroke character | 1.028 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,480 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.0 ci |
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 |
|---|---|---|
| 1997 | — | M111 |
| 1998 | — | M111 |
| 1999 | — | M111 |
| 2000 | — | M111 |
| 2002 | — | M111 |
1 factory vehicle, 1997–2002. Each year opens that model's engine table.