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BMW M62B44 specs: 4.4L (268 ci) 8-cylinder, 92 x 82.7 mm (3.6220 x 3.2559 in) bore and stroke. Rated 282-290 hp, 1996–2003. Used in the BMW 7 Series.
The BMW M62B44 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).
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. 9 factory variants share these dimensions, rated from 282 to 290 hp across 1996–2003.
| Displacement | 268 ci / 4.4 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.2559" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10–10.2:1 (published figures vary) |
| Bore/stroke ratio | 1.112 |
| Fuel type | gas |
|---|---|
| Advertised HP | 282–290 hp |
| Years | 1996–2003 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1996 | M62B44 net | 282 @ 5400 | 324 lb-ft @ 3600 | 10:1 |
| 1997 | M62B44 net | 282 @ 5400 | 324 lb-ft @ 3600 | 10:1 |
| 1998 | M62B44 net | 282 @ 5400 | 324 lb-ft @ 3600 | 10:1 |
| 1999 | M62B44 net | 282 @ 5400 | 324 lb-ft @ 3600 | 10:1 |
| 2000 | M62B44 net | 282 @ 5400 | 324 lb-ft @ 3600 | 10:1 |
| 2001 | M62B44 net | 282 @ 5400 | 324 lb-ft @ 3600 | 10:1 |
| 2002 | M62B44 net | 290 @ 5400 | 324 lb-ft @ 3600 | 10.2:1 |
| 2003 | M62B44 net | 290 @ 5400 | 324 lb-ft @ 3600 | 10.2:1 |
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 |
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 |
|---|---|---|
| 1996 | 282 hp | M62B44 |
| 1997 | 282 hp | M62B44 |
| 1998 | 282 hp | M62B44 |
| 1999 | 282 hp | M62B44 |
| 2000 | 282 hp | M62B44 |
| 2001 | — | M62B44 |
| 2001 | 282 hp | M62B44 |
| 2002 | 290 hp | M62B44 |
| 2003 | 290 hp | M62B44 |
2 factory vehicles, 1996–2003. Each year opens that model's engine table.