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Ford SCTi specs: 91.5 ci (1.5L) 4-cylinder, 3.11 x 3.008 in (79 x 76.4 mm) bore and stroke, 10:1 compression. Rated 160 hp. DOHC. Rod ratio and piston speed.
The Ford SCTi is close to square: 3.1102" bore against 3.0079" stroke, within 3.4%, which splits the difference between a high-revving layout and a torque layout. The 3.0079" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.9 ci (375 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. Factory fitments include the Ford Fusion/Mondeo, Ford Escape/Kuga, Ford Focus.
| Displacement | 91.5 ci / 1.5 L |
|---|---|
| Bore | 3.1102" |
| Stroke | 3.0079" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.034 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 160 hp |
| Bore/stroke character | 1.034 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,008 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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