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Mazda ZM-DE specs: 1.598L (97.5 ci) 4-cylinder, 78 x 83.6 mm (3.0709 x 3.2913 in) bore and stroke. Built 1999–2001. Used in the Mazda Protege. DOHC.
The Mazda ZM-DE is undersquare — the 3.2913" stroke exceeds the 3.0709" bore by 6.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.2913" stroke does not reach 4,000 ft/min of mean piston speed until about 7,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.4 ci (399 cc).
It is one of 21 engines in the B-Series family, sitting between the 97 ci and 112.2 ci members. 3 factory variants share these dimensions across 1999–2001.
| Displacement | 97.5 ci / 1.598 L |
|---|---|
| Bore | 3.0709" |
| Stroke | 3.2913" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.933 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Years | 1999–2001 |
| Bore/stroke character | 0.933 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,291 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.4 ci |
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 |
|---|---|---|
| 1999 | — | ZM-DE |
| 2000 | — | ZM-DE |
| 2001 | — | ZM-DE |
1 factory vehicle, 1999–2001. Each year opens that model's engine table.