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Toyota 4A specs: 1.6L (96.9 ci) 4-cylinder, 81 x 77 mm (3.1890 x 3.0315 in) bore and stroke. Used in the Toyota Corolla and Toyota MR2.
The Toyota A-series (4A) is oversquare — the 3.189" bore exceeds the 3.0315" stroke by 5.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.0315" stroke does not reach 4,000 ft/min of mean piston speed until about 7,900 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.2 ci (397 cc).
It is one of 10 engines in the A-series family, the smallest at 96.9 ci.
| Displacement | 96.9 ci / 1.6 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.0315" |
| Cylinders | 4 |
| Compression ratio | 8–9.5:1 (published figures vary) |
| Bore/stroke ratio | 1.052 |
| Fuel type | gas |
|---|
| Bore/stroke character | 1.052 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,032 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.2 ci |
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3 factory vehicles, 1983–1997. Each year opens that model's engine table.