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BMW S54B32 specs: 3.2L (198 ci) 6-cylinder, 87 x 91 mm (3.4252 x 3.5827 in) bore and stroke, 11.5:1 compression. Rated 315-333 hp, 2001–2008.
The BMW S54B32 is close to square: 3.4252" bore against 3.5827" stroke, within 4.4%, which splits the difference between a high-revving layout and a torque layout. The 3.5827" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 33.0 ci (541 cc).
11.5:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
11 factory variants share these dimensions, rated from 315 to 333 hp across 2001–2008.
| Displacement | 198 ci / 3.2 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.5827" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 11.5:1 |
| Bore/stroke ratio | 0.956 |
| Fuel type | gas |
|---|---|
| Firing order | 1-5-3-6-2-4 |
| Advertised HP | 315–333 hp |
| Years | 2001–2008 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2001 | S54B32 net | 315 | 258 lb-ft | — |
| 2001 | S54B32 net | 333 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2002 | S54B32 net | 315 | 258 lb-ft | — |
| 2002 | S54B32 net | 333 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2003 | S54B32 net | 333 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2004 | S54B32 net | 333 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2005 | S54B32 net | 333 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2006 | S54B32 net | 330 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2006 | S54B32 net | 333 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2007 | S54B32 net | 330 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
| 2008 | S54B32 net | 330 @ 7900 | 262 lb-ft @ 4900 | 11.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.956 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,583 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.0 ci |
| Static compression | 11.5:1 — 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 |
|---|---|---|
| 2001 | 315 hp | S54B32 |
| 2001 | 333 hp | S54B32 |
| 2002 | 315 hp | S54B32 |
| 2002 | 333 hp | S54B32 |
| 2003 | 333 hp | S54B32 |
| 2004 | 333 hp | S54B32 |
| 2005 | 333 hp | S54B32 |
| 2006 | 330 hp | S54B32 |
| 2006 | 333 hp | S54B32 |
| 2007 | 330 hp | S54B32 |
| 2008 | 330 hp | S54B32 |
3 factory vehicles, 2001–2008. Each year opens that model's engine table.