BMW 98ci specs: 77 x 85.8 mm (3.0315 x 3.3780 in) bore and stroke, shared by all 4 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 98 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.031" |
| Stroke | 3.378" |
| Compression | 8.3–11.0:1 |
| Advertised power | 208 hp |
| Years | 2002–2013 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| W10B16 | 98 ci | 3.0315" × 3.378" | 10.6:1 | — |
| W11B16 | 98 ci | 3.0315" × 3.378" | 8.3:1 | — |
| N12B16 / N16B16 | 98 ci | 3.0315" × 3.378" | 11:1 | — |
| N14B16 / N18B16 | 98 ci | 3.0315" × 3.378" | 10.5:1 | 208 |
Compression spans 8.3:1 to 11:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
All are undersquare — stroke larger than bore, favouring torque low in the range.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.