Bore, stroke, displacement and compression for all 2 Hyundai Orion engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 79.3–91.5 ci |
|---|---|
| Cylinders | 4 |
| Bore | 2.815–2.972" |
| Stroke | 3.228–3.287" |
| Compression | 9.4:1 |
| Advertised power | 72–82 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| G4GR | 91.5 ci | 2.9724" × 3.2874" | 9.4:1 | 82 |
| G4CR | 79.3 ci | 2.815" × 3.2283" | 9.4:1 | 72 |
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.