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Jeep ERB specs: 220 ci (3.6L) 6-cylinder, 3.78 x 3.268 in (96 x 83 mm) bore and stroke. Rated 290-295 hp, 2011–2022. Used in the Jeep Grand Cherokee. DOHC.
The Jeep Pentastar (ERB) is oversquare — the 3.7795" bore exceeds the 3.2677" stroke by 15.7% — 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 6 cylinders displaces 36.7 ci (601 cc).
It is one of 5 engines in the Pentastar family, all of them 220 ci — the differences between them are in compression, heads and rating, not displacement. 12 factory variants share these dimensions, rated from 290 to 295 hp across 2011–2022.
| Displacement | 220 ci / 3.6 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.2677" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.157 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 290–295 hp |
| Years | 2011–2022 |
| Bore/stroke character | 1.157 — 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 | 36.7 ci |
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 |
|---|---|---|
| 2011 | 290 hp | ERB |
| 2012 | 290 hp | ERB |
| 2013 | 290 hp | ERB |
| 2014 | 290 hp | ERB |
| 2015 | 290 hp | ERB |
| 2016 | 295 hp | ERB |
| 2017 | 295 hp | ERB |
| 2018 | 295 hp | ERB |
| 2019 | 295 hp | ERB |
| 2020 | 295 hp | ERB |
| 2021 | 295 hp | ERB |
| 2022 | 295 hp | ERB |