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Mercury 2.8L V6 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 109 hp. Rod ratio and piston speed.
The Mercury 2.8L V6 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 10 engines in the Cologne family, the smallest at 170 ci. Factory fitments include the Mercury Capri, Mercury Bobcat.
| Displacement | 170 ci / 2.8 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 2.6969" |
| Cylinders | 6 |
| 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 | 109 hp |
| 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 |
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