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Jeep F4-134 specs: 134 ci (2.2L) 4-cylinder, 3.126 x 4.374 in (79.4 x 111.1 mm) bore and stroke. Rated 72-75 hp, 1950–1971. Used in the Willys Wagon. F-head.
The Jeep F4-134 is undersquare — the 4.374" stroke exceeds the 3.126" bore by 28.5% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.374" stroke, mean piston speed reaches 4,000 ft/min at only 5,500 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 4 cylinders displaces 33.5 ci (549 cc).
It is one of 5 engines in the Hurricane F-Head family, all of them 134 ci — the differences between them are in compression, heads and rating, not displacement. 24 factory variants share these dimensions, rated from 72 to 75 hp across 1950–1971.
| Displacement | 134 ci / 2.2 L |
|---|---|
| Bore | 3.126" |
| Stroke | 4.374" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 6.9–7.4:1 (published figures vary) |
| Bore/stroke ratio | 0.715 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | F-head |
| Fuel type | gas |
| Advertised HP | 72–75 hp |
| Years | 1950–1971 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1953 | gross | 72 @ 4000 | — | 7.4:1 |
| 1961 | gross | 72 @ 4000 | 114 lb-ft @ 2000 | 6.9:1 |
Factory specification sheet.
| Bore/stroke character | 0.715 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,374 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.5 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 |
|---|---|---|
| 1950 | 72 hp | F4-134 |
| 1951 | — | F4-134 |
| 1951 | 72 hp | F4-134 |
| 1952 | 72 hp | F4-134 |
| 1953 | 72 hp | F4-134 |
| 1954 | 72 hp | F4-134 |
| 1955 | 72 hp | F4-134 |
| 1956 | 72 hp | F4-134 |
| 1957 | 72 hp | F4-134 |
| 1958 | 72 hp | F4-134 |
| 1959 | 72 hp | F4-134 |
| 1960 | 72 hp | F4-134 |
| 1961 | — | F4-134 |
| 1961 | 72 hp | F4-134 |
| 1962 | 72 hp | F4-134 |
| 1963 | 72 hp | F4-134 |
| 1964 | 72 hp | F4-134 |
| 1965 | 72 hp | F4-134 |
| 1966 | 75 hp | F4-134 |
| 1967 | 75 hp | F4-134 |
| 1968 | 75 hp | F4-134 |
| 1969 | 75 hp | F4-134 |
| 1970 | 75 hp | F4-134 |
| 1971 | 75 hp | F4-134 |
3 factory vehicles, 1950–1971. Each year opens that model's engine table.