Nissan SR20 specs: 86 x 86 mm (3.3858 x 3.3858 in) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 121.9 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.386" |
| Stroke | 3.386" |
| Compression | 8.3–10.3:1 |
| Advertised power | 140–276 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| SR20 · 3.386" × 3.386" · 10:1 | 121.9 ci | 3.3858" × 3.3858" | 10:1 | 140–145 |
| SR20VE | 121.9 ci | 3.3858" × 3.3858" | 10.3:1 | 187 |
| SR20VET | 121.9 ci | 3.3858" × 3.3858" | 9:1 | 276 |
| SR20 · 3.386" × 3.386" · 8.5:1 | 121.9 ci | 3.3858" × 3.3858" | 8.5:1 | 205–250 |
| SR20DET (Pulsar GTi-R) | 121.9 ci | 3.3858" × 3.3858" | 8.3:1 | 227 |
Compression spans 8.3:1 to 10.3:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.