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Ford SCTi specs: 97.6 ci (1.6L) 4-cylinder, 3.11 x 3.205 in (79 x 81.4 mm) bore and stroke, 10:1 compression. Rated 150-200 hp. Rod ratio and piston speed.
The Ford SCTi is close to square: 3.1102" bore against 3.2047" stroke, within 2.9%, which splits the difference between a high-revving layout and a torque layout. The 3.2047" stroke does not reach 4,000 ft/min of mean piston speed until about 7,500 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.4 ci (400 cc).
10:1 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 24 engines in the EcoBoost family, sitting between the 61 ci and 213.4 ci members. 3 factory variants share these dimensions, rated from 150 to 200 hp. Factory fitments include the Ford C-Max, Ford Focus, Ford Mondeo and 2 others.
| Displacement | 97.6 ci / 1.6 L |
|---|---|
| Bore | 3.1102" |
| Stroke | 3.2047" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.971 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 150–200 hp |
| Bore/stroke character | 0.971 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,205 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.4 ci |
| Static compression | 10:1 — 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 |
|---|---|---|
| — | 150 hp | SCTi |
| — | 182 hp | SCTi |
| — | 200 hp | SCTi |