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Kia G2.5 T-GDi specs: 2.5L (152.5 ci) 4-cylinder, 88.5 x 101.5 mm (3.4843 x 3.9961 in) bore and stroke, 10.5:1 compression. Rated 290 hp. DOHC.
The Kia G2.5 T-GDi is undersquare — the 3.9961" stroke exceeds the 3.4843" bore by 12.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.9961" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.1 ci (625 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 K5 GT, Kia Sorento, Kia Sportage.
| Displacement | 152.5 ci / 2.5 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.9961" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.872 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 290 hp |
| Bore/stroke character | 0.872 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,996 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.1 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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