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Ford Dragon specs: 91.5 ci (1.5L) 3-cylinder, 3.307 x 3.543 in (84 x 90 mm) bore and stroke, 11:1 compression. Rated 150-200 hp. Rod ratio and piston speed.
The Ford Dragon is undersquare — the 3.5433" stroke exceeds the 3.3071" bore by 6.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 3 cylinders displaces 30.5 ci (500 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
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 Focus, Ford Kuga/Escape, Ford Puma and 1 other.
| Displacement | 91.5 ci / 1.5 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5433" |
| Cylinders | 3 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 0.933 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 150–200 hp |
| Bore/stroke character | 0.933 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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 | Dragon |
| — | 182 hp | Dragon |
| — | 200 hp | Dragon |