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Toyota 1UZ-FE specs: 4.0L (242 ci) 8-cylinder, 87.5 x 82.5 mm (3.4449 x 3.2480 in) bore and stroke, 10.4:1 compression. Rated 260 hp. DOHC.
The Toyota 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).
10.4:1 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 7 engines in the UZ V8 family, the smallest at 242 ci. Factory fitments include the Lexus LS 400, Lexus SC 400, Toyota Crown Majesta.
| Displacement | 242 ci / 4 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.248" |
| Cylinders | 8 |
| Compression ratio | 10.4:1 |
| Bore/stroke ratio | 1.061 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 260 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 | 10.4:1 — in the range that usually runs on pump premium |
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