Bore, stroke, displacement and compression for all 14 Mazda B-Series engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 97–112.2 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.071–3.268" |
| Stroke | 3.291–3.346" |
| Compression | 8.4–10.0:1 |
| Advertised power | 115–178 hp |
| Years | 1990–2005 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| BP Miata NB | 112.2 ci | 3.2677" × 3.3465" | 9.5:1 | 140 |
| BP-Z3 | 112.2 ci | 3.2677" × 3.3465" | 10:1 | 142 |
| BP-ZE | 112.2 ci | 3.2677" × 3.3465" | 9:1 | 130–131 |
| BP-ZET | 112.2 ci | 3.2677" × 3.3465" | 8.4:1 | 178 |
| BP-ZE | 112.2 ci | 3.2677" × 3.3465" | — | 128–133 |
| BP-4W | 112.2 ci | 3.2677" × 3.3465" | — | 140 |
| BP-Z3 | 112.2 ci | 3.2677" × 3.3465" | — | 142 |
| BP-Z3 turbo | 112.2 ci | 3.2677" × 3.3465" | — | 178 |
| BP-Z3 | 112 ci | 3.2677" × 3.3465" | 10:1 | 142 |
| BP-ZE | 112 ci | 3.2677" × 3.3465" | 9:1 | 128 |
| BP-4W | 112 ci | 3.2677" × 3.3465" | 9.5:1 | 140 |
| B6-ZE | 97.5 ci | 3.0709" × 3.2913" | 9.4:1 | 115–116 |
| B6-ZE | 97 ci | 3.0709" × 3.2913" | 9.4:1 | 115 |
| B6-ZE | 97 ci | 3.0709" × 3.2913" | — | 116 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 8.4:1 to 10:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
3 of 14 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.