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Mazda VC specs: 1.8L (108 ci) 4-cylinder, 80 x 88 mm (3.1496 x 3.4646 in) bore and stroke. Built 1977. Used in the Mazda B-Series. Rod ratio and piston speed.
The Mazda 108ci (VC) is undersquare — the 3.4646" stroke exceeds the 3.1496" bore by 9.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.0 ci (442 cc).
| Displacement | 108 ci / 1.8 L |
|---|---|
| Bore | 3.1496" * |
| Stroke | 3.4646" * |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.909 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 1977 |
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.0 ci |
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1 factory vehicle, 1977. Each year opens that model's engine table.