Bore, stroke, displacement and compression for all 12 Acura Honda B-series engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 97–121.8 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.189–3.307" |
| Stroke | 3.047–3.504" |
| Compression | 8.8–10.8:1 |
| Advertised power | 126–195 hp |
| Years | 1994–2000 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| B20B | 121.8 ci | 3.3071" × 3.5039" | 8.8:1 | 126 |
| B20Z | 121.8 ci | 3.3071" × 3.5039" | 9.6:1 | 146 |
| Honda B-series · 3.189" × 3.504" · 9.2:1 | 110 ci | 3.189" × 3.5039" | 9.2:1 | 130–140 |
| Honda B-series · 3.189" × 3.433" · 10:1 | 110 ci | 3.189" × 3.4331" | 10:1 | 169–170 |
| B18C5 | 110 ci | 3.189" × 3.4331" | 10.8:1 | 195 |
| B18C | 110 ci | 3.189" × 3.4331" | 10.6:1 | 180 |
| B17A1 | 103.7 ci | 3.189" × 3.2047" | 9.7:1 | 160 |
| Honda B-series · 3.189" × 3.047" · 10.2:1 | 97 ci | 3.189" × 3.0472" | 10.2:1 | 150–160 |
| B16B | 97 ci | 3.189" × 3.0472" | 10.8:1 | 185 |
| B16A3 | 97 ci | 3.189" × 3.0472" | — | 160 |
| B16A3 / B16A2 | 97 ci | 3.189" × 3.0472" | — | 160 |
| B16A2 | 97 ci | 3.189" × 3.0472" | — | 160 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 8.8:1 to 10.8:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
6 of 12 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.