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BMW M60B30 specs: 3.0L (183 ci) 8-cylinder, 84 x 67.6 mm (3.3071 x 2.6614 in) bore and stroke, 10.5:1 compression. Built 1994–1995. Used in the BMW 5 Series.
The BMW M60B30 is oversquare — the 3.3071" bore exceeds the 2.6614" stroke by 24.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.6614" stroke does not reach 4,000 ft/min of mean piston speed until about 9,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 22.9 ci (375 cc).
10.5:1 is in the range that usually runs on pump premium.
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. 2 factory variants share these dimensions across 1994–1995.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 2.6614" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.5:1 * |
| Bore/stroke ratio | 1.243 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 1994–1995 |
| Bore/stroke character | 1.243 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,661 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 1994 | — | M60B30 |
| 1995 | — | M60B30 |
1 factory vehicle, 1994–1995. Each year opens that model's engine table.