BMW 243ci specs: 89 x 80 mm (3.5039 x 3.1496 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 243 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.504" |
| Stroke | 3.150" |
| Compression | 10.0:1 |
| Advertised power | 282 hp |
| Years | 1993–1995 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| M60B40 | 243 ci | 3.5039" × 3.1496" | 10:1 | 282 |
This family is represented by a single engine in the database: 243 ci, 8 cylinders, a 3.5039" × 3.1496" 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.