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Toyota 7A-FE specs: 1.8L (107.5 ci) 4-cylinder, 81 x 85.5 mm (3.1890 x 3.3661 in) bore and stroke, 9.5:1 compression. Used in the Toyota Corolla.
The Toyota 7A-FE is undersquare — the 3.3661" stroke exceeds the 3.189" bore by 5.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3661" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 26.9 ci (440 cc).
9.5:1 is in the range that usually runs on pump premium.
It is one of 10 engines in the A-series family, the largest at 107.5 ci.
| Displacement | 107.5 ci / 1.8 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.3661" |
| Cylinders | 4 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 0.947 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|
| Bore/stroke character | 0.947 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,366 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.9 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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2 factory vehicles, 1993–1997. Each year opens that model's engine table.