Bore, stroke, displacement and compression for all 3 Hyundai Epsilon engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 48.8–67.1 ci |
|---|---|
| Cylinders | 3, 4 |
| Bore | 2.598–2.638" |
| Stroke | 2.874–3.071" |
| Compression | 9.6–10.1:1 |
| Advertised power | 54–66 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| G4HG | 67.1 ci | 2.6378" × 3.0709" | 10.1:1 | 66 |
| G4HC | 61 ci | 2.5984" × 2.874" | 9.6:1 | 60 |
| 08 | 48.8 ci | 2.5984" × 3.0709" | 10:1 | 54 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
All are undersquare — stroke larger than bore, favouring torque low in the range.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.