Bore, stroke, displacement and compression for all 2 Hyundai R engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 121.9–134.3 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.307–3.362" |
| Stroke | 3.543–3.780" |
| Compression | 16.0:1 |
| Advertised power | 184–200 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| D4HB | 134.3 ci | 3.3622" × 3.7795" | 16:1 | 200 |
| D4HA | 121.9 ci | 3.3071" × 3.5433" | 16:1 | 184 |
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.