Bore, stroke, displacement and compression for all 5 Ford Mazda-built Fours engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 112.3–121.9 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.268–3.386" |
| Stroke | 3.346–3.386" |
| Advertised power | 127 hp |
| Years | 1984–1996 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Mazda RF | 121.9 ci | 3.3858" × 3.3858" | — | — |
| Mazda RF | 121.9 ci | 3.3858" × 3.3858" | — | — |
| Mazda RF 2.0 diesel | 121.9 ci | 3.3858" × 3.3858" | — | — |
| Mazda BP | 112.3 ci | 3.2677" × 3.3465" | — | — |
| Mazda BP | 112.3 ci | 3.2677" × 3.3465" | — | 127 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
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.