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Mercury 3 0 Vulcan V6 specs: 182 ci (3.0L) 6-cylinder, 3.50 x 3.15 in (88.9 x 80 mm) bore and stroke, 9.3:1 compression. Rated 140 hp. OHV.
The Mercury 3 0 Vulcan V6 is oversquare — the 3.5" bore exceeds the 3.1496" stroke by 11.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.1496" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.3 ci (497 cc).
9.3:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Vulcan family, all of them 182 ci — the differences between them are in compression, heads and rating, not displacement. Factory fitments include the Mercury Sable, Mercury Cougar, Mercury Mariner and 1 other.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.5" |
| Stroke | 3.1496" |
| Cylinders | 6 |
| Compression ratio | 9.3:1 |
| Bore/stroke ratio | 1.111 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 140 hp |
| Bore/stroke character | 1.111 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,150 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.3 ci |
| Static compression | 9.3:1 — low by modern standards, generally happy on regular pump fuel |
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