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Ford Cologne 4.0 specs: 245 ci (4.0L) 6-cylinder, 3.953 x 3.323 in (100.4 x 84.4 mm) bore and stroke, 9:1 compression. Built 1990–1997.
The Ford Cologne 4.0 is oversquare — the 3.9528" bore exceeds the 3.3228" stroke by 19.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.3228" stroke does not reach 4,000 ft/min of mean piston speed until about 7,200 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 40.8 ci (669 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 6 engines in the Ford 245ci family, all of them 245 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions across 1990–1997.
| Displacement | 245 ci / 4 L |
|---|---|
| Bore | 3.9528" |
| Stroke | 3.3228" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.19 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Firing order | 1-4-2-5-3-6 |
| Years | 1990–1997 |
| Bore/stroke character | 1.190 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,323 ft/min — conservative for a street engine |
| Displacement per cylinder | 40.8 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1990 | — | Cologne 4.0 |
| 1991 | — | Cologne 4.0 |
| 1992 | — | Cologne 4.0 |
| 1993 | — | Cologne 4.0 |
| 1994 | — | Cologne 4.0 |
| 1995 | — | Cologne 4.0 |
| 1996 | — | Cologne 4.0 |
| 1997 | — | Cologne 4.0 |
1 factory vehicle, 1990–1997. Each year opens that model's engine table.