Bore, stroke, displacement and compression for all 4 Volkswagen 97ci engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 97 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.012–3.130" |
| Stroke | 3.150–3.402" |
| Compression | 8.2–23.5:1 |
| Advertised power | 52–78 hp |
| Years | 1976–1986 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 1.6 gas (EE/EJ/FN) | 97 ci | 3.1299" × 3.1496" | 8.2:1 | 71–78 |
| CR (1.6 diesel) | 97 ci | 3.0118" × 3.4016" | 23.5:1 | 52 |
| CY (1.6 turbodiesel) | 97 ci | 3.0118" × 3.4016" * | 23:1 | 68 |
| FN / EE | 97 ci | 3.1299" × 3.1496" | 8.2:1 | — |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 8.2:1 to 23.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
2 of 4 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.