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Jeep 2.4L PowerTech DOHC I4 specs: 148 ci (2.4L) 4-cylinder, 3.445 x 3.976 in (87.5 x 101 mm) bore and stroke, 9.5:1 compression. Rated 150 hp, 2002–2005.
The Jeep 2.4L PowerTech DOHC I4 is undersquare — the 3.9764" stroke exceeds the 3.4449" bore by 13.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.9764" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 37.0 ci (606 cc).
9.5:1 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 3 engines in the Jeep 148ci family, all of them 148 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 150 hp across 2002–2005.
| Displacement | 148 ci / 2.4 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.9764" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 0.866 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 6,240 rpm (factory limit) |
| Advertised HP | 150 hp |
| Years | 2002–2005 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2004 | net | 150 @ 5200 | 165 lb-ft @ 4000 | — |
| 2005 | net | 150 @ 5200 | 165 lb-ft @ 4000 | 9.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.866 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,976 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.0 ci |
| Static compression | 9.5:1 — 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 |
|---|---|---|
| 2002 | 150 hp | 2.4L PowerTech DOHC I4 |
| 2003 | 150 hp | 2.4L PowerTech DOHC I4 |
| 2004 | 150 hp | 2.4L PowerTech DOHC I4 |
| 2005 | 150 hp | 2.4L PowerTech DOHC I4 |
1 factory vehicle, 2002–2005. Each year opens that model's engine table.