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Ford Model T four specs: 176.7 ci (2.9L) 4-cylinder, 3.75 x 4.00 in (95.3 x 101.6 mm) bore and stroke. Rod ratio and piston speed worked out.
The Ford Model T four is undersquare — the 4" stroke exceeds the 3.75" bore by 6.3% — a layout that trades peak RPM for leverage and torque low in the range. The 4" 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 4 cylinders displaces 44.2 ci (724 cc).
It is one of 2 engines in the Model T Four family, all of them 176.7 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 176.7 ci / 2.9 L |
|---|---|
| Bore | 3.75" |
| Stroke | 4" |
| Cylinders | 4 |
| Bore/stroke ratio | 0.938 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.938 — 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 | 44.2 ci |
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