Bore, stroke, displacement and compression for all 2 Mitsubishi Global Engine engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 122–144 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.386–3.465" |
| Stroke | 3.386–3.819" |
| Compression | 9.0–10.5:1 |
| Advertised power | 168–291 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 4B12 | 144 ci | 3.4646" × 3.8189" | 10.5:1 | 168 |
| 4B11T | 122 ci | 3.3858" × 3.3858" | 9:1 | 291 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 9:1 to 10.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
1 of 2 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.