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Kia G2.5 DPi specs: 2.5L (152.5 ci) 4-cylinder, 88.5 x 101.5 mm (3.4843 x 3.9961 in) bore and stroke, 13:1 compression. Rated 191 hp. DOHC.
The Kia G2.5 DPi 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).
13:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
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, Kia Sorento, Kia Sportage and 1 other.
| Displacement | 152.5 ci / 2.5 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.9961" |
| Cylinders | 4 |
| Compression ratio | 13:1 |
| Bore/stroke ratio | 0.872 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 191 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 | 13:1 — high enough that pump premium or better is normally required |
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