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Toyota 2F specs: 4.2L (258.1 ci) 6-cylinder, 94 x 101.6 mm (3.7008 x 3.9995 in) bore and stroke. OHV. Rod ratio and piston speed worked out.
The Toyota F-series (2F) is undersquare — the 3.9995" stroke exceeds the 3.7008" bore by 7.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.9995" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 43.0 ci (705 cc).
It is one of 11 engines in the F-series family, sitting between the 236.7 ci and 273.2 ci members.
| Displacement | 258.1 ci / 4.2 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.9995" |
| Cylinders | 6 |
| Bore/stroke ratio | 0.925 |
| Valvetrain | OHV |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 0.925 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.0 ci |
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