See other engines in this family
BMW N54/B58 specs: 3.0L (182.7 ci) 6-cylinder, 82 x 94.6 mm (3.2283 x 3.7244 in) bore and stroke, 11:1 compression. Rated 322-382 hp. DOHC.
The BMW N54/B58 is undersquare — the 3.7244" stroke exceeds the 3.2283" bore by 13.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.5 ci (499 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 3 engines in the N54/B58 family, all of them 182.7 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated from 322 to 382 hp. Factory fitments include the BMW Z4 M40i, Toyota Supra (A90), BMW M340i and 13 others.
| Displacement | 182.7 ci / 3 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.7244" |
| Cylinders | 6 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 0.867 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 322–382 hp |
| Bore/stroke character | 0.867 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.4 ci |
| Static compression | 11:1 — 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 |
|---|---|---|
| — | 322 hp | B58B30M0, N54B30 |
| — | 335 hp | B58B30M1 |
| — | 374 hp | B58B30T0 |
| — | 382 hp | B58B30O1 |