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Kia G1.2 DPi specs: 1.2L (73.23 ci) 4-cylinder, 71 x 75.6 mm (2.7953 x 2.9764 in) bore and stroke, 12:1 compression. Rated 84 hp. Rod ratio and piston speed.
The Kia G1.2 DPi is undersquare — the 2.9764" stroke exceeds the 2.7953" bore by 6.1% — a layout that trades peak RPM for leverage and torque low in the range. The 2.9764" stroke does not reach 4,000 ft/min of mean piston speed until about 8,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 18.3 ci (300 cc).
12:1 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 Picanto, Kia Rio.
| Displacement | 73.23 ci / 1.2 L |
|---|---|
| Bore | 2.7953" |
| Stroke | 2.9764" |
| Cylinders | 4 |
| Compression ratio | 12:1 |
| Bore/stroke ratio | 0.939 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 84 hp |
| Bore/stroke character | 0.939 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 2,976 ft/min — conservative for a street engine |
| Displacement per cylinder | 18.3 ci |
| Static compression | 12:1 — high enough that pump premium or better is normally required |
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