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Lexus B48B20 specs: 2.0L (121.9 ci) 4-cylinder, 80.5 x 97.6 mm (3.1693 x 3.8425 in) bore and stroke. Rated 255 hp, 2021–2024. Used in the Toyota Supra. DOHC.
The Lexus B48B20 is undersquare — the 3.8425" stroke exceeds the 3.1693" bore by 17.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8425" stroke puts mean piston speed at 4,000 ft/min around 6,250 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (499 cc).
It is one of 15 engines in the Dynamic Force family, the smallest at 121.9 ci. 4 factory variants share these dimensions, rated at 255 hp across 2021–2024.
| Displacement | 121.9 ci / 2 L |
|---|---|
| Bore | 3.1693" |
| Stroke | 3.8425" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.825 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 255 hp |
| Years | 2021–2024 |
| Bore/stroke character | 0.825 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,843 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2021 | 255 hp | B48B20 |
| 2022 | 255 hp | B48B20 |
| 2023 | 255 hp | B48B20 |
| 2024 | 255 hp | B48B20 |