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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. Rated 20 hp, 1909–1927. Used in the Ford Model T.
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. 19 factory variants share these dimensions, rated at 20 hp across 1909–1927.
| Displacement | 176.7 ci / 2.9 L |
|---|---|
| Bore | 3.75" |
| Stroke | 4" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.938 |
| Fuel type | gas |
|---|---|
| Advertised HP | 20 hp |
| Years | 1909–1927 |
| 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 |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1909 | 20 hp | Model T four |
| 1910 | 20 hp | Model T four |
| 1911 | 20 hp | Model T four |
| 1912 | 20 hp | Model T four |
| 1913 | 20 hp | Model T four |
| 1914 | 20 hp | Model T four |
| 1915 | 20 hp | Model T four |
| 1916 | 20 hp | Model T four |
| 1917 | 20 hp | Model T four |
| 1918 | 20 hp | Model T four |
| 1919 | 20 hp | Model T four |
| 1920 | 20 hp | Model T four |
| 1921 | 20 hp | Model T four |
| 1922 | 20 hp | Model T four |
| 1923 | 20 hp | Model T four |
| 1924 | 20 hp | Model T four |
| 1925 | 20 hp | Model T four |
| 1926 | 20 hp | Model T four |
| 1927 | 20 hp | Model T four |
1 factory vehicle, 1909–1927. Each year opens that model's engine table.