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Toyota 1FZ-FE specs: 4.5L (273.2 ci) 6-cylinder, 100 x 95 mm (3.9370 x 3.7402 in) bore and stroke. DOHC. Rod ratio and piston speed worked out.
The Toyota 1FZ-FE is oversquare — the 3.937" bore exceeds the 3.7402" stroke by 5.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.7402" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 45.5 ci (746 cc).
It is one of 11 engines in the F-series family, the largest at 273.2 ci.
| Displacement | 273.2 ci / 4.5 L |
|---|---|
| Bore | 3.937" |
| Stroke | 3.7402" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.053 |
| Valvetrain | DOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 1.053 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,740 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 45.5 ci |
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