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Mercury Zetec specs: 121 ci (2.0L) 4-cylinder, 3.339 x 3.465 in (84.8 x 88 mm) bore and stroke, 9.6:1 compression. Rated 125-130 hp, 1999–2002.
The Mercury Zetec is close to square: 3.3386" bore against 3.4646" stroke, within 3.6%, which splits the difference between a high-revving layout and a torque layout. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.3 ci (496 cc).
9.6:1 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.
6 factory variants share these dimensions, rated from 125 to 130 hp across 1999–2002. Factory fitments include the Mercury Mystique, Mercury Cougar.
| Displacement | 121 ci / 2 L |
|---|---|
| Bore | 3.3386" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 0.964 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 125–130 hp |
| Years | 1999–2002 |
| Bore/stroke character | 0.964 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.3 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| — | 130 hp | 2.0L I4 |
| — | 130 hp | 2.0L Zetec |
| 1999 | 125 hp | Zetec 2.0 |
| 2000 | 125 hp | Zetec 2.0 |
| 2001 | 125 hp | Zetec 2.0 |
| 2002 | 125 hp | Zetec 2.0 |