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BMW N54B30 specs: 3.0L (182.7 ci) 6-cylinder, 84 x 89.6 mm (3.3071 x 3.5276 in) bore and stroke, 9.4:1 compression. Rated 360 hp. Rod ratio and piston speed.
The BMW N54B30 is undersquare — the 3.5276" stroke exceeds the 3.3071" bore by 6.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5276" stroke puts mean piston speed at 4,000 ft/min around 6,800 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).
9.4:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
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. Factory fitments include the Alpina B3 Bi-Turbo, Alpina B3 S Bi-Turbo, Alpina B3 GT3.
| Displacement | 182.7 ci / 3 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5276" |
| Cylinders | 6 |
| Compression ratio | 9.4:1 |
| Bore/stroke ratio | 0.937 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 360 hp |
| Bore/stroke character | 0.937 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,528 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.4 ci |
| Static compression | 9.4:1 — low by modern standards, generally happy on regular pump fuel |
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