Jeep Magnum specs: 3.909 x 3.311 in (99.3 x 84.1 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 318 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.909" |
| Stroke | 3.311" |
| Compression | 9.1:1 |
| Advertised power | 220 hp |
| Years | 1993–1998 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| ELF | 318 ci | 3.9094" × 3.311" | 9.1:1 | 220 |
| Magnum 5.2 | 318 ci | 3.9094" × 3.311" | — | 220 |
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.