Bore, stroke, displacement and compression for all 9 Audi EA824 engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 244.1–317.4 ci |
|---|---|
| Cylinders | 8, 10 |
| Bore | 3.327" |
| Stroke | 3.504–3.661" |
| Compression | 10.1–12.7:1 |
| Advertised power | 300–610 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| EA824 · 3.327" × 3.654" · 12.5:1 | 317.4 ci | 3.3268" × 3.6535" | 12.5:1 | 525–540 |
| DESG, DMSA | 317.4 ci | 3.3268" × 3.6535" | 12.7:1 | 610 |
| EA824 · 3.327" × 3.654" · 12.5:1 | 317.3 ci | 3.3268" × 3.6535" | 12.5:1 | 525–550 |
| EA824 · 3.327" × 3.654" · 12.7:1 | 317.3 ci | 3.3268" × 3.6535" | 12.7:1 | 540–610 |
| EA824 · 3.327" × 3.661" · 11:1 | 256.3 ci | 3.3268" × 3.6614" | 11:1 | 335–340 |
| EA824 · 3.327" × 3.661" · 12.5:1 | 256.3 ci | 3.3268" × 3.6614" | 12.5:1 | 420–450 |
| ABZ, AKB, AUX, BFM | 256.3 ci | 3.3268" × 3.6614" | 10.8:1 | 300 |
| 42 V8 FSI | 254 ci | 3.3268" × 3.6535" | 12.5:1 | 420 |
| CEUC, CTFA, CWUB, CWUC | 244.1 ci | 3.3268" × 3.5039" | 10.1:1 | 420 |
Every engine here shares a 3.3268" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
Compression spans 10.1:1 to 12.7:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.