Bore, stroke, displacement and compression for all 5 BMW S5x engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 182.7–195.2 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.386–3.425" |
| Stroke | 3.378–3.583" |
| Compression | 10.5–11.5:1 |
| Advertised power | 240–360 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| S50B32 | 195.2 ci | 3.4016" × 3.5827" | 11.3:1 | 321 |
| S52B32US | 195.2 ci | 3.4016" × 3.5827" | 10.5:1 | 240 |
| S5x · 3.425" × 3.583" · 11.5:1 | 195.2 ci | 3.4252" × 3.5827" | 11.5:1 | 333–360 |
| S50B30 | 182.7 ci | 3.3858" × 3.378" | 10.8:1 | 286 |
| S50B30 US | 182.7 ci | 3.3858" × 3.378" | 10.5:1 | 240 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
2 of 5 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.