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Mercedes-Benz OM654 specs: 2.0L (119 ci) 4-cylinder, 82 x 92.3 mm (3.2283 x 3.6339 in) bore and stroke, 15.5:1 compression. Rated 168-208 hp, 2023–2026.
The Mercedes-Benz OM654 is undersquare — the 3.6339" stroke exceeds the 3.2283" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6339" stroke puts mean piston speed at 4,000 ft/min around 6,600 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 29.8 ci (488 cc).
At 15.5:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
8 factory variants share these dimensions, rated from 168 to 208 hp across 2023–2026.
| Displacement | 119 ci / 2 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.6339" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 15.5:1 * |
| Bore/stroke ratio | 0.888 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | diesel |
|---|---|
| Advertised HP | 168–208 hp |
| Years | 2023–2026 |
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,634 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 29.8 ci |
| Static compression | 15.5:1 — 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 |
|---|---|---|
| 2023 | 168 hp | OM654 |
| 2023 | 208 hp | OM654 |
| 2024 | 168 hp | OM654 |
| 2024 | 208 hp | OM654 |
| 2025 | 168 hp | OM654 |
| 2025 | 208 hp | OM654 |
| 2026 | 168 hp | OM654 |
| 2026 | 208 hp | OM654 |
1 factory vehicle, 2023–2026. Each year opens that model's engine table.