Toyota 121ci specs: 80.5 x 97.6 mm (3.1693 x 3.8425 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 121.9 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.169" |
| Stroke | 3.842" |
| Compression | 13.0:1 |
| Advertised power | 168–169 hp |
| Years | 2019–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| M20A-FKS | 121.9 ci | 3.1693" × 3.8425" | 13:1 | 168–169 |
This family is represented by a single engine in the database: 121.9 ci, 4 cylinders, a 3.1693" × 3.8425" 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.