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Hyundai 08 specs: 0.8L (48.8 ci) 3-cylinder, 66 x 78 mm (2.5984 x 3.0709 in) bore and stroke, 10:1 compression. Rated 54 hp. SOHC. Rod ratio and piston speed.
The Hyundai Epsilon (08) is undersquare — the 3.0709" stroke exceeds the 2.5984" bore by 15.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.0709" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 3 cylinders displaces 16.3 ci (267 cc).
10:1 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 3 engines in the Epsilon family, the smallest at 48.8 ci. Factory fitments include the Hyundai Atos, Kia Morning, Hyundai Santro.
| Displacement | 48.8 ci / 0.8 L |
|---|---|
| Bore | 2.5984" |
| Stroke | 3.0709" |
| Cylinders | 3 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.846 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 54 hp |
| Bore/stroke character | 0.846 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,071 ft/min — conservative for a street engine |
| Displacement per cylinder | 16.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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