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Mercedes-Benz M277 specs: 6.0L (365 ci) 12-cylinder, 82.6 x 93 mm (3.2520 x 3.6614 in) bore and stroke. Built 2015–2017. Used in the Mercedes-Benz S-Class.
The Mercedes-Benz M277 is undersquare — the 3.6614" stroke exceeds the 3.252" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6614" stroke puts mean piston speed at 4,000 ft/min around 6,550 RPM, which is where a production bottom end is generally considered at its limit. Each of the 12 cylinders displaces 30.4 ci (498 cc).
It is one of 4 engines in the Mercedes-Benz 365ci family, all of them 365 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions across 2015–2017.
| Displacement | 365 ci / 6 L |
|---|---|
| Bore | 3.252" * |
| Stroke | 3.6614" * |
| Cylinders | 12 |
| Bore/stroke ratio | 0.888 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 2015–2017 |
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,661 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.4 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 |
|---|---|---|
| 2015 | — | M277 |
| 2016 | — | M277 |
| 2017 | — | M277 |
1 factory vehicle, 2015–2017. Each year opens that model's engine table.