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Dodge EGH 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 162-215 hp, 1994–2010. OHV.
The Dodge 231ci (EGH) 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.
17 factory variants share these dimensions, rated from 162 to 215 hp across 1994–2010.
| Displacement | 231 ci / 3.8 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.4252" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 1.103 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 162–215 hp |
| Years | 1994–2010 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1997 | net | 166 @ 4300 | 227 lb-ft @ 3100 | — |
| 1999 | net | 180 | 240 lb-ft | — |
| 2004 | net | 215 @ 5000 | 245 lb-ft @ 4000 | 9.6:1 |
| 2008 | net | 197 | 230 lb-ft | 9.6:1 |
| 2009 | net | 197 @ 5200 | 230 lb-ft @ 4000 | — |
Factory specification sheet.
| 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 |
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 |
|---|---|---|
| 1994 | 162 hp | EGH |
| 1995 | 162 hp | EGH |
| 1996 | 166 hp | EGH |
| 1997 | 166 hp | EGH |
| 1998 | 180 hp | EGH |
| 1999 | 180 hp | EGH |
| 2000 | 180 hp | EGH |
| 2001 | 215 hp | EGH |
| 2002 | 215 hp | EGH |
| 2003 | 215 hp | EGH |
| 2004 | 215 hp | EGH |
| 2005 | 215 hp | EGH |
| 2006 | — | EGH |
| 2007 | — | EGH |
| 2008 | 197 hp | EGH |
| 2009 | 197 hp | EGH |
| 2010 | 197 hp | EGH |