Bore, stroke, displacement and compression for all 5 Acura Honda D-series engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 91.5–103.7 ci |
|---|---|
| Cylinders | 4 |
| Bore | 2.953" |
| Stroke | 3.327–3.716" |
| Compression | 9.3–9.9:1 |
| Advertised power | 113–130 hp |
| Years | 1986–1989 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| D17A | 103.7 ci | 2.9528" × 3.7165" | 9.9:1 | 130 |
| D16A | 97 ci | 2.9528" × 3.5433" | 9.5:1 | 120 |
| D16Y | 97 ci | 2.9528" × 3.5433" | 9.6:1 | 127 |
| D16A1 | 97 ci | 2.9528" × 3.5433" | — | 113–118 |
| D15B | 91.5 ci | 2.9528" × 3.3268" | 9.3:1 | 130 |
Every engine here shares a 2.9528" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
All 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.