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Ford Model 01A specs: 221 ci (3.6L) 8-cylinder, 3.063 x 3.75 in (77.8 x 95.3 mm) bore and stroke, 6.15:1 compression. Rated 85 hp, 1940.
The Ford Model 01A is undersquare — the 3.75" stroke exceeds the 3.0625" bore by 18.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.75" 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 8 cylinders displaces 27.6 ci (453 cc).
6.15:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 26 engines in the Flathead V8 family, sitting between the 135.9 ci and 239.4 ci members.
| Displacement | 221 ci / 3.6 L |
|---|---|
| Bore | 3.0625" |
| Stroke | 3.75" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 6.15:1 * |
| Bore/stroke ratio | 0.817 |
* Compression ratio from a single source; not yet cross-verified.
| Head material | aluminum |
|---|---|
| Valvetrain | flathead |
| Fuel type | gas |
| Advertised HP | 85 hp |
| Years | 1940 |
| Bore/stroke character | 0.817 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,750 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 27.6 ci |
| Static compression | 6.15:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1940. Each year opens that model's engine table.