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Ram EcoDiesel 3.0 I-4 specs: 182 ci (3.0L) 4-cylinder, 3.772 x 4.095 in (95.8 x 104 mm) bore and stroke, 17.5:1 compression. Rated 174 hp, 2014–2017.
The Ram EcoDiesel 3.0 I-4 is undersquare — the 4.0945" stroke exceeds the 3.7717" bore by 7.9% — a layout that trades peak RPM for leverage and torque low in the range. The 4.0945" stroke puts mean piston speed at 4,000 ft/min around 5,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 45.5 ci (746 cc).
At 17.5:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
4 factory variants share these dimensions, rated at 174 hp across 2014–2017.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.7717" * |
| Stroke | 4.0945" * |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 17.5:1 |
| Bore/stroke ratio | 0.921 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | diesel |
|---|---|
| Advertised HP | 174 hp |
| Years | 2014–2017 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2014 | net | 174 @ 3600 | 295 lb-ft @ 1400 | — |
| 2015 | net | 174 @ 3600 | 295 lb-ft @ 1400 | — |
| 2016 | net | 174 @ 3600 | 295 lb-ft @ 1400 | — |
| 2017 | net | 174 @ 3500 | 295 lb-ft @ 1400 | — |
Factory specification sheet.
| Bore/stroke character | 0.921 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,095 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 45.5 ci |
| Static compression | 17.5:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2014 | 174 hp | EcoDiesel 3.0 I-4 |
| 2015 | 174 hp | EcoDiesel 3.0 I-4 |
| 2016 | 174 hp | EcoDiesel 3.0 I-4 |
| 2017 | 174 hp | EcoDiesel 3.0 I-4 |
1 factory vehicle, 2014–2017. Each year opens that model's engine table.