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Jeep 38 EGL V6 specs: 231 ci (3.8L) 6-cylinder, 3.78 x 3.425 in (96 x 87 mm) bore and stroke, 9.6:1 compression. Rated 202 hp. Rod ratio and piston speed.
The Jeep 38 EGL V6 is oversquare — the 3.7795" bore exceeds the 3.4252" stroke by 10.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4252" stroke puts mean piston speed at 4,000 ft/min around 7,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 38.5 ci (631 cc).
9.6:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 2 engines in the EGH family, all of them 231 ci — the differences between them are in compression, heads and rating, not displacement. Factory fitments include the Wrangler JK.
| Displacement | 231 ci / 3.8 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.4252" |
| Cylinders | 6 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 1.103 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 202 hp |
| Bore/stroke character | 1.103 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,425 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.5 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
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