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BMW N62B44 specs: 4.4L (268 ci) 8-cylinder, 92 x 82.7 mm (3.6220 x 3.2559 in) bore and stroke, 10.5:1 compression. Rated 315-325 hp, 2002–2008.
The BMW N62B44 is oversquare — the 3.622" bore exceeds the 3.2559" stroke by 11.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.2559" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 33.5 ci (549 cc).
10.5:1 is in the range that usually runs on pump premium.
It is one of 12 engines in the BMW 268ci family, all of them 268 ci — the differences between them are in compression, heads and rating, not displacement. 11 factory variants share these dimensions, rated from 315 to 325 hp across 2002–2008.
| Displacement | 268 ci / 4.4 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.2559" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.112 |
| Fuel type | gas |
|---|---|
| Advertised HP | 315–325 hp |
| Years | 2002–2008 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2002 | N62B44 net | 325 | 330 lb-ft @ 3600 | — |
| 2003 | N62B44 net | 325 | 330 lb-ft @ 3600 | — |
| 2004 | N62B44 net | 315 @ 5400 | 324 lb-ft @ 3600 | 10.5:1 |
| 2004 | N62B44 net | 325 | 330 lb-ft @ 3600 | — |
| 2005 | N62B44 net | 315 @ 5400 | 324 lb-ft @ 3600 | 10.5:1 |
| 2005 | N62B44 net | 325 | 330 lb-ft @ 3600 | — |
| 2006 | N62B44 net | 315 @ 5400 | 324 lb-ft @ 3600 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 1.112 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,256 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.5 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 |
|---|---|---|
| 2002 | 325 hp | N62B44 |
| 2003 | 325 hp | N62B44 |
| 2004 | — | N62B44 |
| 2004 | 315 hp | N62B44 |
| 2004 | 325 hp | N62B44 |
| 2005 | — | N62B44 |
| 2005 | 315 hp | N62B44 |
| 2005 | 325 hp | N62B44 |
| 2006 | 315 hp | N62B44 |
| 2007 | — | N62B44 |
| 2008 | — | N62B44 |
4 factory vehicles, 2002–2008. Each year opens that model's engine table.