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Ford 3.3 Ti-VCT specs: 204 ci (3.3L) 6-cylinder, 3.559 x 3.413 in (90.4 x 86.7 mm) bore and stroke, 12:1 compression. DOHC. Rod ratio and piston speed.
The Ford 3.3 Ti-VCT is close to square: 3.5594" bore against 3.4134" stroke, within 4.3%, which splits the difference between a high-revving layout and a torque layout. The 3.4134" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 34.0 ci (557 cc).
12:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 4 engines in the Cyclone V6 family, all of them 204 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 204 ci / 3.3 L |
|---|---|
| Bore | 3.5594" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Compression ratio | 12:1 |
| Bore/stroke ratio | 1.043 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Bore/stroke character | 1.043 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
| Displacement per cylinder | 34.0 ci |
| Static compression | 12:1 — high enough that pump premium or better is normally required |
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