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BMW N12B16 / N16B16 specs: 1.6L (98 ci) 4-cylinder, 77 x 85.8 mm (3.0315 x 3.3780 in) bore and stroke, 11:1 compression. Built 2007–2013.
The BMW N12B16 / N16B16 is undersquare — the 3.378" stroke exceeds the 3.0315" bore by 10.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.378" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.5 ci (401 cc).
11:1 is high enough that pump premium or better is normally required.
It is one of 4 engines in the BMW 98ci family, all of them 98 ci — the differences between them are in compression, heads and rating, not displacement. 7 factory variants share these dimensions across 2007–2013.
| Displacement | 98 ci / 1.6 L |
|---|---|
| Bore | 3.0315" |
| Stroke | 3.378" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11:1 * |
| Bore/stroke ratio | 0.897 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 2007–2013 |
| Bore/stroke character | 0.897 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,378 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.5 ci |
| Static compression | 11:1 — 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 |
|---|---|---|
| 2007 | — | N12B16 / N16B16 |
| 2008 | — | N12B16 / N16B16 |
| 2009 | — | N12B16 / N16B16 |
| 2010 | — | N12B16 / N16B16 |
| 2011 | — | N12B16 / N16B16 |
| 2012 | — | N12B16 / N16B16 |
| 2013 | — | N12B16 / N16B16 |
1 factory vehicle, 2007–2013. Each year opens that model's engine table.