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Jeep AMC 150 1-bbl specs: 150 ci (2.5L) 4-cylinder, 3.875 x 3.188 in (98.4 x 81 mm) bore and stroke. Rated 105 hp, 1984–1986. Used in the Jeep CJ. OHV.
The Jeep AMC 150 1-bbl is oversquare — the 3.875" bore exceeds the 3.1875" stroke by 21.6% — a layout that favors airflow and RPM over leverage at the crank. The 3.1875" stroke does not reach 4,000 ft/min of mean piston speed until about 7,550 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 37.5 ci (615 cc).
It is one of 6 engines in the AMC Straight-4 family, all of them 150 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 105 hp across 1984–1986.
| Displacement | 150 ci / 2.5 L |
|---|---|
| Bore | 3.875" |
| Stroke | 3.1875" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.216 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 105 hp |
| Years | 1984–1986 |
| Bore/stroke character | 1.216 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,188 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.5 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 |
|---|---|---|
| 1984 | 105 hp | AMC 150 1-bbl |
| 1985 | 105 hp | AMC 150 1-bbl |
| 1986 | 105 hp | AMC 150 1-bbl |