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BMW B57D30 specs: 3.0L (183 ci) 6-cylinder, 84 x 90 mm (3.3071 x 3.5433 in) bore and stroke, 16.5:1 compression. Rated 261 hp, 2018. Used in the BMW 5 Series.
The BMW B57D30 is undersquare — the 3.5433" stroke exceeds the 3.3071" bore by 6.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.5 ci (500 cc).
At 16.5:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 8 engines in the BMW 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5433" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 16.5:1 * |
| Bore/stroke ratio | 0.933 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | diesel |
|---|---|
| Advertised HP | 261 hp |
| Years | 2018 |
| Bore/stroke character | 0.933 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 16.5:1 — high enough that pump premium or better is normally required |
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1 factory vehicle, 2018. Each year opens that model's engine table.