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Toyota FA24 specs: 2.4L (145.7 ci) 4-cylinder, 94 x 86 mm (3.7008 x 3.3858 in) bore and stroke, 12.5:1 compression. Used in the Toyota 86 / FR-S / GR86.
The Toyota FA24 is oversquare — the 3.7008" bore exceeds the 3.3858" stroke by 9.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 36.4 ci (597 cc).
12.5:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 4 engines in the FA (Subaru-built) family, the largest at 145.7 ci.
| Displacement | 145.7 ci / 2.4 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Compression ratio | 12.5:1 |
| Bore/stroke ratio | 1.093 |
| Fuel type | gas |
|---|
| Bore/stroke character | 1.093 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.4 ci |
| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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1 factory vehicle, 2022–2026. Each year opens that model's engine table.