See other engines in this family
Dodge ECC specs: 122 ci (2.0L) 4-cylinder, 3.445 x 3.268 in (87.5 x 83 mm) bore and stroke, 9.6:1 compression. Rated 150 hp, 1995–1999.
The Dodge 122ci (ECC) is oversquare — the 3.4449" bore exceeds the 3.2677" stroke by 5.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.2677" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.5 ci (500 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 7 engines in the Dodge 122ci family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions, rated at 150 hp across 1995–1999.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2677" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 1.054 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 150 hp |
| Years | 1995–1999 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1995 | ECC net | 150 @ 6500 | 133 lb-ft @ 5500 | — |
| 1999 | net | 150 | 133 lb-ft | — |
Factory specification sheet.
| Bore/stroke character | 1.054 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,268 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 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 |
|---|---|---|
| 1995 | 150 hp | ECC |
| 1996 | 150 hp | ECC |
| 1997 | 150 hp | ECC |
| 1998 | 150 hp | ECC |
| 1999 | 150 hp | ECC |
1 factory vehicle, 1995–1999. Each year opens that model's engine table.