Bore, stroke, displacement and compression for all 3 Hyundai Alpha engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 91.2–97.6 ci |
|---|---|
| Cylinders | 4 |
| Bore | 2.972–2.992" |
| Stroke | 3.287–3.425" |
| Compression | 9.5–10.0:1 |
| Advertised power | 92–105 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| G4ED | 97.6 ci | 2.9921" × 3.4252" | 10:1 | 105 |
| G4EK | 91.5 ci | 2.9724" × 3.2874" | 9.5:1 | 92 |
| G4EK | 91.2 ci | 2.9724" × 3.2874" | 10:1 | 92 |
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.