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Toyota 2RZ-FE specs: 2.4L (148.8 ci) 4-cylinder, 95 x 86 mm (3.7402 x 3.3858 in) bore and stroke. DOHC. Rod ratio and piston speed worked out.
The Toyota 2RZ-FE is oversquare — the 3.7402" bore exceeds the 3.3858" stroke by 10.5% — 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 37.2 ci (610 cc).
It is one of 4 engines in the RZ family, the smallest at 148.8 ci.
| Displacement | 148.8 ci / 2.4 L |
|---|---|
| Bore | 3.7402" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Bore/stroke ratio | 1.105 |
| Valvetrain | DOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 1.105 — 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 | 37.2 ci |
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