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Mercedes-Benz M272 specs: 2.5L (152 ci) 6-cylinder, 88 x 68.4 mm (3.4646 x 2.6929 in) bore and stroke, 11.2:1 compression. Built 2006–2007.
The Mercedes-Benz M272 is oversquare — the 3.4646" bore exceeds the 2.6929" stroke by 28.7% — a layout that favors airflow and RPM over leverage at the crank. The 2.6929" stroke does not reach 4,000 ft/min of mean piston speed until about 8,900 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 25.3 ci (415 cc).
11.2:1 is high enough that pump premium or better is normally required.
It is one of 2 engines in the Mercedes-Benz 152ci family, all of them 152 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions across 2006–2007.
| Displacement | 152 ci / 2.5 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 2.6929" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 11.2:1 * |
| Bore/stroke ratio | 1.287 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 2006–2007 |
| Bore/stroke character | 1.287 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,693 ft/min — conservative for a street engine |
| Displacement per cylinder | 25.3 ci |
| Static compression | 11.2:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2006 | — | M272 |
| 2007 | — | M272 |
1 factory vehicle, 2006–2007. Each year opens that model's engine table.