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Jeep L4-134 specs: 134 ci (2.2L) 4-cylinder, 3.126 x 4.374 in (79.4 x 111.1 mm) bore and stroke, 6.48:1 compression. Rated 63 hp, 1946–1950.
The Jeep L4-134 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).
6.48:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
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. 6 factory variants share these dimensions, rated at 63 hp across 1946–1950.
| Displacement | 134 ci / 2.2 L |
|---|---|
| Bore | 3.126" |
| Stroke | 4.374" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 6.48:1 |
| Bore/stroke ratio | 0.715 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | L-head |
| Fuel type | gas |
| Advertised HP | 63 hp |
| Years | 1946–1950 |
| 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 |
| Static compression | 6.48:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1946 | 63 hp | L4-134 |
| 1947 | 63 hp | L4-134 |
| 1948 | — | L4-134 |
| 1948 | 63 hp | L4-134 |
| 1949 | 63 hp | L4-134 |
| 1950 | 63 hp | L4-134 |
3 factory vehicles, 1946–1950. Each year opens that model's engine table.