Jeep 4.0 I6 specs: 3.875 x 3.41 in (98.4 x 86.6 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 242 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.875" |
| Stroke | 3.410" |
| Compression | 9.2:1 |
| Advertised power | 173 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| AMC 242 (Renix) | 242 ci | 3.8752" × 3.4098" | 9.2:1 | 173 |
This family is represented by a single engine in the database: 242 ci, 6 cylinders, a 3.8752" × 3.4098" 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.