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Kia G4LH specs: 1.5L (90.4 ci) 4-cylinder, 71.6 x 92 mm (2.8189 x 3.6220 in) bore and stroke, 10.5:1 compression. Rated 160 hp. Rod ratio and piston speed.
The Kia G4LH is undersquare — the 3.622" stroke exceeds the 2.8189" bore by 22.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 22.6 ci (370 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 16 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 | 90.4 ci / 1.5 L |
|---|---|
| Bore | 2.8189" |
| Stroke | 3.622" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.778 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 160 hp |
| Bore/stroke character | 0.778 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 22.6 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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