Bore, stroke, displacement and compression for all 7 Mercury Essex engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 232 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.811" |
| Stroke | 3.386–3.390" |
| Compression | 8.2–9.3:1 |
| Advertised power | 112–210 hp |
| Years | 1982–1997 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 3.8L | 232 ci | 3.811" × 3.3898" | 9:1 | 155 |
| Essex · 3.811" × 3.386" · 9:1 | 232 ci | 3.811" × 3.3858" | 9:1 | 120–140 |
| 3.8L Supercharged V6 | 232 ci | 3.811" × 3.3858" | 8.2:1 | 210 |
| 232 V6 | 232 ci | 3.811" × 3.3898" | 8.7:1 | 112 |
| 232 Essex V6 Split Port | 232 ci | 3.811" × 3.3858" | 9.3:1 | 190 |
| 232 Essex V6 Supercharged | 232 ci | 3.811" × 3.3858" | 8.5:1 | 210 |
| Essex (1982–1997) | 232 ci | 3.811" × 3.3858" | — | 112–210 |
Every engine here shares a 3.811" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
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.