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Toyota 2AZ specs: 2.4L (144.2 ci) 4-cylinder, 88.5 x 96 mm (3.4843 x 3.7795 in) bore and stroke. Used in the Toyota Highlander and Toyota Camry.
The Toyota AZ (2AZ) is undersquare — the 3.7795" stroke exceeds the 3.4843" bore by 7.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7795" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.1 ci (591 cc).
It is one of 3 engines in the AZ family, all of them 144.2 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 144.2 ci / 2.4 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.7795" |
| Cylinders | 4 |
| Compression ratio | 9.6–12.5:1 (published figures vary) |
| Bore/stroke ratio | 0.922 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.922 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,780 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.0 ci |
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7 factory vehicles, 2001–2015. Each year opens that model's engine table.