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Ford HSC specs: 153 ci (2.5L) 4-cylinder, 3.68 x 3.58 in (93.5 x 90.9 mm) bore and stroke, 9:1 compression. Rated 90 hp, 1986–1991. Used in the Ford Taurus.
The Ford 153ci (HSC) is close to square: 3.68" bore against 3.58" stroke, within 2.8%, which splits the difference between a high-revving layout and a torque layout. The 3.58" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.3 ci (627 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Ford 153ci family, all of them 153 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 90 hp across 1986–1991.
| Displacement | 153 ci / 2.5 L |
|---|---|
| Bore | 3.68" |
| Stroke | 3.58" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 * |
| Bore/stroke ratio | 1.028 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 90 hp |
| Years | 1986–1991 |
| Bore/stroke character | 1.028 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,580 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.3 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1986 | — | HSC |
| 1987 | 90 hp | HSC |
| 1988 | 90 hp | HSC |
| 1989 | 90 hp | HSC |
| 1990 | 90 hp | HSC |
| 1991 | — | HSC |
2 factory vehicles, 1986–1991. Each year opens that model's engine table.