Bore, stroke, displacement and compression for all 4 Mercedes-Benz M113 engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 262.4–332.5 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.539–3.819" |
| Stroke | 3.307–3.622" |
| Compression | 9.0–10.5:1 |
| Advertised power | 275–469 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| M113 E55 | 332.5 ci | 3.8189" × 3.622" | 10.5:1 | 349 |
| M113 E55 ML | 332.5 ci | 3.8189" × 3.622" | 9:1 | 469 |
| M113 E50 | 302.7 ci | 3.8189" × 3.3071" | 10:1 | 302 |
| M113 E43 | 262.4 ci | 3.5394" × 3.3071" | 10:1 | 275 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 9:1 to 10.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.