See other engines in this family
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. Rated 250-300 hp, 1990–2000. Used in the Lexus LS. 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).
It is one of 8 engines in the UZ family, the smallest at 242 ci. 15 factory variants share these dimensions, rated from 250 to 300 hp across 1990–2000.
| Displacement | 242 ci / 4 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.248" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10–10.5:1 (published figures vary) |
| Bore/stroke ratio | 1.061 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Firing order | 1-8-4-3-6-5-7-2 |
| Advertised HP | 250–300 hp |
| Years | 1990–2000 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1992 | 1UZ-FE net | 250 @ 5600 * | 260 lb-ft @ 4400 * | 10:1 * |
| 1995 | 1UZ-FE net | 260 @ 5300 | 270 lb-ft @ 4500 | 10.4:1 |
| 1996 | 1UZ-FE net | 260 @ 5300 | 270 lb-ft @ 4500 | 10.4:1 |
| 1997 | 1UZ-FE net | 260 @ 5300 | 270 lb-ft @ 4500 | 10.4:1 |
| 1998 | 1UZ-FE net | 290 @ 6000 | 300 lb-ft @ 4000 | 10.5:1 |
| 1998 | 1UZ-FE net | 300 @ 6000 | 310 lb-ft @ 4000 | 10.5:1 |
| 1999 | 1UZ-FE net | 290 @ 6000 | 300 lb-ft @ 4000 | 10.5:1 |
| 1999 | 1UZ-FE net | 300 @ 6000 | 310 lb-ft @ 4000 | 10.5:1 |
| 2000 | 1UZ-FE net | 290 @ 6000 | 300 lb-ft @ 4000 | 10.5:1 |
| 2000 | 1UZ-FE net | 300 @ 6000 | 310 lb-ft @ 4000 | 10.5:1 |
Factory specification sheet. * Not yet cross-verified.
| 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 |
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 |
|---|---|---|
| 1990 | 250 hp | 1UZ-FE |
| 1991 | 250 hp | 1UZ-FE |
| 1992 | 250 hp | 1UZ-FE |
| 1993 | 250 hp | 1UZ-FE |
| 1994 | 250 hp | 1UZ-FE |
| 1995 | 250 hp | 1UZ-FE |
| 1995 | 260 hp | 1UZ-FE |
| 1996 | 260 hp | 1UZ-FE |
| 1997 | 260 hp | 1UZ-FE |
| 1998 | 290 hp | 1UZ-FE |
| 1998 | 300 hp | 1UZ-FE |
| 1999 | 290 hp | 1UZ-FE |
| 1999 | 300 hp | 1UZ-FE |
| 2000 | 290 hp | 1UZ-FE |
| 2000 | 300 hp | 1UZ-FE |
3 factory vehicles, 1990–2000. Each year opens that model's engine table.