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Mazda MA specs: 2.0L (120 ci) 4-cylinder, 80 x 98 mm (3.1496 x 3.8583 in) bore and stroke, 8.6:1 compression. Built 1979–1984. Used in the Mazda 626.
The Mazda 120ci (MA) is undersquare — the 3.8583" stroke exceeds the 3.1496" bore by 18.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8583" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.0 ci (492 cc).
8.6:1 is low by modern standards and generally happy on regular pump fuel.
3 factory variants share these dimensions across 1979–1984.
| Displacement | 120 ci / 2 L |
|---|---|
| Bore | 3.1496" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.6:1 |
| Bore/stroke ratio | 0.816 |
| Fuel type | gas |
|---|---|
| Years | 1979–1984 |
| Bore/stroke character | 0.816 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,858 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.0 ci |
| Static compression | 8.6:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1979 | — | MA |
| 1980 | — | MA |
| 1984 | — | MA |
2 factory vehicles, 1979–1984. Each year opens that model's engine table.