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Mazda FS-DET specs: 2.0L (122 ci) 4-cylinder, 83 x 92 mm (3.2677 x 3.6220 in) bore and stroke. Rated 170 hp, 2003. Used in the Mazda Protege.
The Mazda FS-DET is undersquare — the 3.622" stroke exceeds the 3.2677" bore by 9.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (500 cc).
It is one of 4 engines in the Mazda 122ci family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.622" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.902 |
| Fuel type | gas |
|---|---|
| Advertised HP | 170 hp |
| Years | 2003 |
| Bore/stroke character | 0.902 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 2003. Each year opens that model's engine table.