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Toyota SkyActiv-G 1.5 specs: 1.5L (91 ci) 4-cylinder, 74.5 x 85.8 mm (2.9331 x 3.3780 in) bore and stroke. Rated 106 hp, 2017–2020. Used in the Toyota Yaris.
The Toyota SkyActiv-G 1.5 is undersquare — the 3.378" stroke exceeds the 2.9331" bore by 13.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.378" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.8 ci (373 cc).
It is one of 3 engines in the Toyota 91ci family, all of them 91 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 106 hp across 2017–2020.
| Displacement | 91 ci / 1.5 L |
|---|---|
| Bore | 2.9331" |
| Stroke | 3.378" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.868 |
| Fuel type | gas |
|---|---|
| Advertised HP | 106 hp |
| Years | 2017–2020 |
| Bore/stroke character | 0.868 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,378 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.8 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 | — | SkyActiv-G 1.5 |
| 2018 | — | SkyActiv-G 1.5 |
| 2019 | — | SkyActiv-G 1.5 |
| 2020 | 106 hp | SkyActiv-G 1.5 |
1 factory vehicle, 2017–2020. Each year opens that model's engine table.