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BMW N74B60 specs: 6.0L (364 ci) 12-cylinder, 89 x 80 mm (3.5039 x 3.1496 in) bore and stroke, 10:1 compression. Built 2010–2015. Used in the BMW 7 Series.
The BMW N74B60 is oversquare — the 3.5039" bore exceeds the 3.1496" stroke by 11.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.1496" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 12 cylinders displaces 30.3 ci (497 cc).
10:1 is in the range that usually runs on pump premium.
It is one of 2 engines in the BMW 364ci family, all of them 364 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions across 2010–2015.
| Displacement | 364 ci / 6 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.1496" |
| Cylinders | 12 |
| Compression ratio | 10:1 * |
| Bore/stroke ratio | 1.112 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 2010–2015 |
| Bore/stroke character | 1.112 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,150 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.3 ci |
| Static compression | 10:1 — 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 |
|---|---|---|
| 2010 | — | N74B60 |
| 2011 | — | N74B60 |
| 2012 | — | N74B60 |
| 2013 | — | N74B60 |
| 2014 | — | N74B60 |
| 2015 | — | N74B60 |
1 factory vehicle, 2010–2015. Each year opens that model's engine table.