Bore, stroke, displacement and compression for all 10 Lexus UR engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 280.7–346 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.701" |
| Stroke | 3.256–4.016" |
| Compression | 10.2–12.3:1 |
| Advertised power | 310–472 hp |
| Years | 2007–2021 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 3UR-FE | 346 ci | 3.7008" × 4.0157" | 10.2:1 | 383 |
| 3UR-FE | 346 ci | 3.7008" × 4.0157" | — | 381 |
| 3UR-FE | 345.6 ci | 3.7008" × 4.0157" | 10.2:1 | 381 |
| 2UR-GSE | 303.9 ci | 3.7008" × 3.5236" | 12.3:1 | 467–471 |
| 2UR-FSE | 303.9 ci | 3.7008" × 3.5236" | 11.8:1 | 389 |
| UR · 3.701" × 3.524" · 11.8:1 | 303 ci | 3.7008" × 3.5236" | 11.8:1 | 389–416 |
| 2UR-GSE | 303 ci | 3.7008" × 3.5236" | 12.3:1 | 467–472 |
| 1UR-FSE | 281 ci | 3.7008" × 3.2677" | 11.8:1 | 380 |
| 1UR-FSE | 280.7 ci | 3.7008" × 3.2559" | 11.8:1 | 380 |
| 1UR-FE | 280.7 ci | 3.7008" × 3.2559" | 10.2:1 | 310 |
Every engine here shares a 3.7008" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
Compression spans 10.2:1 to 12.3:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
The family mixes oversquare and undersquare designs, so members behave quite differently despite sharing a name.
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.