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Lexus 1UR-FE specs: 4.6L (280.7 ci) 8-cylinder, 94 x 82.7 mm (3.7008 x 3.2559 in) bore and stroke, 10.2:1 compression. Rated 310 hp. DOHC.
The Lexus 1UR-FE is oversquare — the 3.7008" bore exceeds the 3.2559" stroke by 13.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.2559" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 35.1 ci (575 cc).
10.2:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 10 engines in the UR family, the smallest at 280.7 ci. Factory fitments include the Lexus GX 460, Toyota Land Cruiser Prado.
| Displacement | 280.7 ci / 4.6 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.2559" |
| Cylinders | 8 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 1.137 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 310 hp |
| Bore/stroke character | 1.137 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,256 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.1 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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