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Jeep 232 specs: 232 ci (3.8L) 6-cylinder, 3.752 x 3.50 in (95.3 x 88.9 mm) bore and stroke, 8.5:1 compression. Rated 100 hp. OHV. Rod ratio and piston speed.
The Jeep AMC I6 (232) is oversquare — the 3.752" bore exceeds the 3.5" stroke by 7.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.5" stroke puts mean piston speed at 4,000 ft/min around 6,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 38.7 ci (634 cc).
8.5:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 7 engines in the AMC I6 family, the smallest at 232 ci. Factory fitments include the CJ-5, Wagoneer, J-Series.
| Displacement | 232 ci / 3.8 L |
|---|---|
| Bore | 3.752" |
| Stroke | 3.5" |
| Cylinders | 6 |
| Compression ratio | 8.5:1 |
| Bore/stroke ratio | 1.072 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 100 hp |
| Bore/stroke character | 1.072 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,500 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.7 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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