Bore, stroke, displacement and compression for all 7 Volvo 142ci engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 142 ci |
|---|---|
| Cylinders | 4, 5 |
| Bore | 3.189–3.780" |
| Stroke | 3.150–3.543" |
| Compression | 8.5–10.0:1 |
| Advertised power | 153–247 hp |
| Years | 1985–2004 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| B230F | 142 ci | 3.7795" × 3.1496" | — | — |
| B230FT | 142 ci | 3.7795" × 3.1496" | 8.7:1 | 160–162 |
| B234F | 142 ci | 3.7795" × 3.1496" | 10:1 | 153 |
| B5234T | 142 ci | 3.189" × 3.5433" | 8.5:1 | — |
| B5234T5 | 142 ci | 3.189" × 3.5433" | 8.5:1 | — |
| B5234T3 | 142 ci | 3.189" × 3.5433" | 8.5:1 | 247 |
| B5234T6 / B5234T8 | 142 ci | 3.189" × 3.5433" | 8.5:1 | 247 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 8.5:1 to 10:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
The family mixes oversquare and undersquare designs, so members behave quite differently despite sharing a name.
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.