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Toyota 2ZR specs: 1.8L (109.7 ci) 4-cylinder, 80.5 x 88.3 mm (3.1693 x 3.4764 in) bore and stroke. Used in the Toyota Corolla and Toyota Matrix.
The Toyota ZR (2ZR) is undersquare — the 3.4764" stroke exceeds the 3.1693" bore by 8.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4764" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.4 ci (449 cc).
It is one of 4 engines in the ZR family, all of them 109.7 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 109.7 ci / 1.8 L |
|---|---|
| Bore | 3.1693" |
| Stroke | 3.4764" |
| Cylinders | 4 |
| Compression ratio | 10–13:1 (published figures vary) |
| Bore/stroke ratio | 0.912 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.912 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,476 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.4 ci |
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2 factory vehicles, 2009–2026. Each year opens that model's engine table.