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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, 7.5:1 compression. Rated 72 hp. Rod ratio and piston speed.
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).
7.5:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Hurricane F-Head family, all of them 134 ci — the differences between them are in compression, heads and rating, not displacement. Factory fitments include the CJ-5, CJ-3B, DJ-3A.
| Displacement | 134 ci / 2.2 L |
|---|---|
| Bore | 3.126" |
| Stroke | 4.374" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 7.5:1 |
| Bore/stroke ratio | 0.715 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | F-head |
| Fuel type | gas |
| Advertised HP | 72 hp |
| 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 | 7.5:1 — low by modern standards, generally happy on regular pump fuel |
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