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Toyota 3F-E specs: 4.0L (241.4 ci) 6-cylinder, 94 x 95 mm (3.7008 x 3.7404 in) bore and stroke. OHV, cast iron block and heads. Rod ratio and piston speed.
The Toyota 3F-E is close to square: 3.7008" bore against 3.7404" stroke, within 1.1%, which splits the difference between a high-revving layout and a torque layout. The 3.7404" 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 40.2 ci (659 cc).
It is one of 11 engines in the F-series family, sitting between the 236.7 ci and 273.2 ci members.
| Displacement | 241.4 ci / 4 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.7404" |
| Cylinders | 6 |
| Bore/stroke ratio | 0.989 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Bore/stroke character | 0.989 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,740 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.2 ci |
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