Mazda 120ci specs: 80 x 98 mm (3.1496 x 3.8583 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 120 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.150" |
| Stroke | 3.858" |
| Compression | 8.6:1 |
| Years | 1979–1984 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| MA | 120 ci | 3.1496" × 3.8583" | 8.6:1 | — |
This family is represented by a single engine in the database: 120 ci, 4 cylinders, a 3.1496" × 3.8583" bore and stroke.
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.