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BMW M62B46 specs: 4.6L (282 ci) 8-cylinder, 93 x 85 mm (3.6614 x 3.3465 in) bore and stroke, 10.5:1 compression. Rated 340 hp, 2002–2003. Used in the BMW X5.
The BMW M62B46 is oversquare — the 3.6614" bore exceeds the 3.3465" stroke by 9.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.3465" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 35.3 ci (578 cc).
10.5:1 is in the range that usually runs on pump premium.
2 factory variants share these dimensions, rated at 340 hp across 2002–2003.
| Displacement | 282 ci / 4.6 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.3465" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.094 |
| Fuel type | gas |
|---|---|
| Advertised HP | 340 hp |
| Years | 2002–2003 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2002 | M62B46 net | 340 @ 5700 | 350 lb-ft @ 3700 | 10.5:1 |
| 2003 | M62B46 net | 340 @ 5700 | 350 lb-ft @ 3700 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 1.094 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,347 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.3 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 | 340 hp | M62B46 |
| 2003 | 340 hp | M62B46 |
1 factory vehicle, 2002–2003. Each year opens that model's engine table.