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Lexus 3UR-FE specs: 5.7L (346 ci) 8-cylinder, 94 x 102 mm (3.7008 x 4.0157 in) bore and stroke, 10.2:1 compression. Rated 383 hp. Rod ratio and piston speed.
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 43.3 ci (709 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 largest at 346 ci. Factory fitments include the LX 570.
| Displacement | 346 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 | 383 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 | 43.3 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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