Bore, stroke, displacement and compression for all 2 Hyundai Sigma engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 181.4–213.6 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.587–3.661" |
| Stroke | 2.992–3.378" |
| Compression | 9.0–10.0:1 |
| Advertised power | 145–195 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| G6AU | 213.6 ci | 3.6614" × 3.378" | 10:1 | 195 |
| G6AT | 181.4 ci | 3.587" × 2.992" | 9:1 | 145 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
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.