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Alfa Romeo 1750 SPICA specs: 109 ci 4-cylinder, 80 x 88.5 mm (3.1496 x 3.4843 in) bore and stroke. Built 1969. Used in the Alfa Romeo Spider.
The Alfa Romeo 1750 SPICA is undersquare — the 3.4843" stroke exceeds the 3.1496" bore by 9.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4843" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.3 ci (447 cc).
| Displacement | 109 ci |
|---|---|
| Bore | 3.1496" |
| Stroke | 3.4843" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.904 |
| Fuel type | gas |
|---|---|
| Years | 1969 |
| Bore/stroke character | 0.904 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,484 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.3 ci |
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1 factory vehicle, 1969. Each year opens that model's engine table.