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Mercury 3 5 Duratec V6 specs: 213 ci (3.5L) 6-cylinder, 3.642 x 3.413 in (92.5 x 86.7 mm) bore and stroke, 10.3:1 compression. Rated 263 hp. DOHC.
The Mercury 3 5 Duratec V6 is oversquare — the 3.6417" bore exceeds the 3.4134" stroke by 6.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.4134" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 35.5 ci (582 cc).
10.3:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 12 engines in the Duratec family, sitting between the 140 ci and 227 ci members. Factory fitments include the Mercury Sable, Mercury Milan, Mercury Mariner and 2 others.
| Displacement | 213 ci / 3.5 L |
|---|---|
| Bore | 3.6417" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Compression ratio | 10.3:1 |
| Bore/stroke ratio | 1.067 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 263 hp |
| Bore/stroke character | 1.067 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.5 ci |
| Static compression | 10.3:1 — in the range that usually runs on pump premium |
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