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Mercedes-Benz M271 specs: 1.8L (110 ci) 4-cylinder, 82 x 85 mm (3.2283 x 3.3465 in) bore and stroke, 8.7:1 compression. Built 2003–2005.
The Mercedes-Benz M271 is close to square: 3.2283" bore against 3.3465" stroke, within 3.5%, which splits the difference between a high-revving layout and a torque layout. The 3.3465" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 27.5 ci (451 cc).
8.7:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Mercedes-Benz 110ci family, all of them 110 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions across 2003–2005.
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.3465" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.7:1 |
| Bore/stroke ratio | 0.965 |
| Fuel type | gas |
|---|---|
| Years | 2003–2005 |
| Bore/stroke character | 0.965 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,347 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.5 ci |
| Static compression | 8.7:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 2003 | — | M271 |
| 2004 | — | M271 |
| 2005 | — | M271 |
1 factory vehicle, 2003–2005. Each year opens that model's engine table.