See other engines in this family
The same engine also has a main page: Toyota 1UZ-FE.
Lexus 1UZ-FE specs: 4.0L (242 ci) 8-cylinder, 87.5 x 82.5 mm (3.4449 x 3.2480 in) bore and stroke, 10:1 compression. Rated 250-256 hp. DOHC.
The Lexus 1UZ-FE is oversquare — the 3.4449" bore exceeds the 3.248" stroke by 6.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.248" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 30.3 ci (496 cc).
10:1 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 5 engines in the UZ family, the smallest at 242 ci. 2 factory variants share these dimensions, rated from 250 to 256 hp. Factory fitments include the Lexus LS 400, Lexus SC 400, Lexus GS 400 and 3 others.
| Displacement | 242 ci / 4 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.248" |
| Cylinders | 8 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.061 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 250–256 hp |
| Bore/stroke character | 1.061 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,248 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 250 hp | 1UZ-FE |
| — | 256 hp | 1UZ-FE |