See other engines in this family
Ford EBU specs: 239 ci 8-cylinder, 3.50 x 3.10 in (88.9 x 78.7 mm) bore and stroke. Rated 130 hp, 1954. Used in the Ford Cars (1949–1954).
The Ford 239ci (EBU) is oversquare — the 3.5" bore exceeds the 3.1" stroke by 12.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.1" stroke does not reach 4,000 ft/min of mean piston speed until about 7,750 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 29.9 ci (490 cc).
It is one of 2 engines in the Ford 239ci family, all of them 239 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 239 ci |
|---|---|
| Bore | 3.5" |
| Stroke | 3.1" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.129 |
| Fuel type | gas |
|---|---|
| Advertised HP | 130 hp |
| Years | 1954 |
| Bore/stroke character | 1.129 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,100 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.9 ci |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 1954. Each year opens that model's engine table.