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International BD-240 specs: 240 ci 6-cylinder, 3.563 x 4.018 in (90.5 x 102.1 mm) bore and stroke. Built 1961. Used in the International Pickup.
The International BD-240 is undersquare — the 4.018" stroke exceeds the 3.5625" bore by 11.3% — a layout that trades peak RPM for leverage and torque low in the range. The 4.018" stroke puts mean piston speed at 4,000 ft/min around 5,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 40.0 ci (655 cc).
| Displacement | 240 ci |
|---|---|
| Bore | 3.5625" |
| Stroke | 4.018" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.887 |
| Fuel type | gas |
|---|---|
| Years | 1961 |
| Bore/stroke character | 0.887 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,018 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.0 ci |
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2 factory vehicles, 1961. Each year opens that model's engine table.