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Mercury Cologne V6 EFI specs: 179.1 ci (2.9L) 6-cylinder, 3.661 x 2.835 in (93 x 72 mm) bore and stroke. Used in the Ford Ranger. Rod ratio and piston speed.
The Mercury Cologne V6 EFI is oversquare — the 3.6614" bore exceeds the 2.8346" stroke by 29.2% — a layout that favors airflow and RPM over leverage at the crank. The 2.8346" stroke does not reach 4,000 ft/min of mean piston speed until about 8,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 29.8 ci (489 cc).
It is one of 5 engines in the Cologne family, sitting between the 170 ci and 245 ci members.
| Displacement | 179.1 ci / 2.9 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 2.8346" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.292 |
| Fuel type | gas |
|---|---|
| Firing order | 1-4-2-5-3-6 |
| Bore/stroke character | 1.292 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,835 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.8 ci |
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1 factory vehicle, 1986–1992. Each year opens that model's engine table.