Opel 115ci specs: 93 x 69.9 mm (3.6600 x 2.7500 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 115 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.660" |
| Stroke | 2.750" |
| Compression | 8.0:1 |
| Advertised power | 81 hp |
| Years | 1975 |
| Cylinder head data | 1 of 1 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 1975 115 81HP | 115 ci | 3.66" × 2.75" | 8.02:1 | 81 |
This family is represented by a single engine in the database: 115 ci, 4 cylinders, a 3.66" × 2.75" bore and stroke.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
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.