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Toyota B58B30 specs: 3.0L (182.9 ci) 6-cylinder, 82 x 94.6 mm (3.2283 x 3.7244 in) bore and stroke. Used in the Toyota Supra. Rod ratio and piston speed.
The Toyota B58B30 is undersquare — the 3.7244" stroke exceeds the 3.2283" bore by 13.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.5 ci (500 cc).
It is one of 4 engines in the BMW B48/B58 (Supra) family, the largest at 182.9 ci.
| Displacement | 182.9 ci / 3 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.7244" |
| Cylinders | 6 |
| Compression ratio | 10.2–11:1 (published figures vary) |
| Bore/stroke ratio | 0.867 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.867 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
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1 factory vehicle, 2020–2026. Each year opens that model's engine table.