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Lexus 3UR-FE specs: 5.7L (345.6 ci) 8-cylinder, 94 x 102 mm (3.7008 x 4.0157 in) bore and stroke, 10.2:1 compression. Rated 381 hp. DOHC.
The Lexus 3UR-FE is undersquare — the 4.0157" stroke exceeds the 3.7008" bore by 7.8% — a layout that trades peak RPM for leverage and torque low in the range. The 4.0157" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 43.2 ci (708 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, sitting between the 280.7 ci and 346 ci members. Factory fitments include the Lexus LX 570, Toyota Tundra, Toyota Sequoia.
| Displacement | 345.6 ci / 5.7 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 4.0157" |
| Cylinders | 8 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 0.922 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 381 hp |
| Bore/stroke character | 0.922 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,016 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.2 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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