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Mercury Cologne (1961–1963) specs: 170 ci (2.8L) 6-cylinder, 3.661 x 2.697 in (93 x 68.5 mm) bore and stroke. Rated 101 hp, 1961–1963. OHV.
The Mercury Cologne (1961–1963) is oversquare — the 3.6614" bore exceeds the 2.6969" stroke by 35.8% — a layout that favors airflow and RPM over leverage at the crank. The 2.6969" stroke does not reach 4,000 ft/min of mean piston speed until about 8,900 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 28.3 ci (464 cc).
It is one of 10 engines in the Cologne family, the smallest at 170 ci. 3 factory variants share these dimensions, rated at 101 hp across 1961–1963.
| Displacement | 170 ci / 2.8 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 2.6969" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 1.358 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 101 hp |
| Years | 1961–1963 |
| Bore/stroke character | 1.358 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,697 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.3 ci |
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 |
|---|---|---|
| 1961 | 101 hp | — |
| 1962 | 101 hp | — |
| 1963 | 101 hp | — |