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Kia G1.5 T-GDi specs: 1.5L (91.54 ci) 4-cylinder, 75.6 x 84 mm (2.9764 x 3.3071 in) bore and stroke, 10.5:1 compression. Rated 160 hp. DOHC.
The Kia G1.5 T-GDi is undersquare — the 3.3071" stroke exceeds the 2.9764" bore by 10.0% — 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 22.9 ci (375 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 13 engines in the Smartstream family, sitting between the 61.02 ci and 213.58 ci members. Factory fitments include the Kia Ceed, Kia XCeed, Kia Sportage (China).
| Displacement | 91.54 ci / 1.5 L |
|---|---|
| Bore | 2.9764" |
| Stroke | 3.3071" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.9 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 160 hp |
| Bore/stroke character | 0.900 — 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 | 22.9 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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