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Mercury Cologne (1961–1972) specs: 170 ci (2.8L) 6-cylinder, 3.661 x 2.697 in (93 x 68.5 mm) bore and stroke, 8.7:1 compression. Rated 82-101 hp, 1961–1972.
The Mercury Cologne (1961–1972) 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).
8.7:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 5 engines in the Cologne family, the smallest at 170 ci. 6 factory variants share these dimensions, rated from 82 to 101 hp across 1961–1972.
| Displacement | 170 ci / 2.8 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 2.6969" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 8.7:1 |
| Bore/stroke ratio | 1.358 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 82–101 hp |
| Years | 1961–1972 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1962 | gross | 101 * | — | 8.7:1 * |
| 1963 | gross | 101 @ 4400 | 156 lb-ft @ 2400 | 8.7:1 |
| 1964 | EET gross | 101 @ 4400 | 156 lb-ft @ 2400 | 8.7:1 |
| 1971 | gross | 100 @ 4200 | — | — |
Factory specification sheet. * Not yet cross-verified.
| 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 |
| Static compression | 8.7:1 — 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 |
|---|---|---|
| 1961 | 101 hp | — |
| 1962 | 101 hp | — |
| 1963 | 101 hp | — |
| 1964 | 101 hp | — |
| 1971 | 100 hp | — |
| 1972 | 82 hp | — |
1 factory vehicle, 1961–1972. Each year opens that model's engine table.