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Fiat MultiAir 1.4 Turbo specs: 84 ci 4-cylinder, 72 x 84 mm (2.8346 x 3.3071 in) bore and stroke. Built 2017–2020. Used in the Fiat 124 Spider.
The Fiat MultiAir 1.4 Turbo is undersquare — the 3.3071" stroke exceeds the 2.8346" bore by 14.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3071" stroke does not reach 4,000 ft/min of mean piston speed until about 7,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 21.0 ci (344 cc).
4 factory variants share these dimensions across 2017–2020.
| Displacement | 84 ci |
|---|---|
| Bore | 2.8346" |
| Stroke | 3.3071" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.857 |
| Fuel type | gas |
|---|---|
| Years | 2017–2020 |
| Bore/stroke character | 0.857 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,307 ft/min — conservative for a street engine |
| Displacement per cylinder | 21.0 ci |
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 |
|---|---|---|
| 2017 | — | MultiAir 1.4 Turbo |
| 2018 | — | MultiAir 1.4 Turbo |
| 2019 | — | MultiAir 1.4 Turbo |
| 2020 | — | MultiAir 1.4 Turbo |
1 factory vehicle, 2017–2020. Each year opens that model's engine table.