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Ford SPI 2.0 specs: 121 ci (2.0L) 4-cylinder, 3.339 x 3.465 in (84.8 x 88 mm) bore and stroke. Rated 110 hp, 2000–2004. Used in the Ford Focus. DOHC.
The Ford SPI 2.0 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).
It is one of 5 engines in the Ford 121ci family, all of them 121 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions, rated at 110 hp across 2000–2004.
| Displacement | 121 ci / 2 L |
|---|---|
| Bore | 3.3386" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.964 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 110 hp |
| Years | 2000–2004 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2002 | net | 110 * | — | — |
| 2003 | net | 110 @ 5000 | 125 lb-ft @ 3750 | — |
Factory specification sheet. * Not yet cross-verified.
| 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 |
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 |
|---|---|---|
| 2000 | 110 hp | SPI 2.0 |
| 2001 | 110 hp | SPI 2.0 |
| 2002 | 110 hp | SPI 2.0 |
| 2003 | 110 hp | SPI 2.0 |
| 2004 | 110 hp | SPI 2.0 |
1 factory vehicle, 2000–2004. Each year opens that model's engine table.