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Lexus 2UR-FSE specs: 5.0L (303.9 ci) 8-cylinder, 94 x 89.5 mm (3.7008 x 3.5236 in) bore and stroke, 11.8:1 compression. Rated 389 hp. DOHC.
The Lexus 2UR-FSE is oversquare — the 3.7008" bore exceeds the 3.5236" stroke by 5.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.5236" stroke puts mean piston speed at 4,000 ft/min around 6,800 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 38.0 ci (623 cc).
11.8:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
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 LS 600h, Lexus GS 450h.
| Displacement | 303.9 ci / 5 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.5236" |
| Cylinders | 8 |
| Compression ratio | 11.8:1 |
| Bore/stroke ratio | 1.05 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 389 hp |
| Bore/stroke character | 1.050 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,524 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.0 ci |
| Static compression | 11.8:1 — high enough that pump premium or better is normally required |
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