Mitsubishi 3A9 specs: 75 x 90 mm (2.9528 x 3.5433 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 73 ci |
|---|---|
| Cylinders | 3 |
| Bore | 2.953" |
| Stroke | 3.543" |
| Compression | 11.0:1 |
| Advertised power | 78 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 3A92 | 73 ci | 2.9528" × 3.5433" | 11:1 | 78 |
This family is represented by a single engine in the database: 73 ci, 3 cylinders, a 2.9528" × 3.5433" 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.