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Mercury DOHC 4.6 Modular specs: 281 ci (4.6L) 8-cylinder, 3.551 x 3.543 in (90.2 x 90 mm) bore and stroke. Rated 302 hp, 2003–2004.
The Mercury DOHC 4.6 Modular is close to square: 3.5512" bore against 3.5433" stroke, within 0.2%, which splits the difference between a high-revving layout and a torque layout. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 35.1 ci (576 cc).
It is one of 6 engines in the Modular family, all of them 281 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 302 hp across 2003–2004.
| Displacement | 281 ci / 4.6 L |
|---|---|
| Bore | 3.5512" |
| Stroke | 3.5433" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.002 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 302 hp |
| Years | 2003–2004 |
| Bore/stroke character | 1.002 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.1 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 |
|---|---|---|
| 2003 | 302 hp | DOHC 4.6 Modular |
| 2004 | 302 hp | DOHC 4.6 Modular |