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Chevrolet LUJ specs: 83.2 ci (1.4L) 4-cylinder, 2.854 x 3.252 in (72.5 x 82.6 mm) bore and stroke, 9.5:1 compression. Rated 138 hp, 2011–2016.
The Chevrolet 83ci (LUJ) is undersquare — the 3.252" stroke exceeds the 2.8543" bore by 12.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.252" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 20.8 ci (341 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 2 engines in the Chevrolet 83ci family, all of them 83.2 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 138 hp across 2011–2016.
| Displacement | 83.2 ci / 1.4 L |
|---|---|
| Bore | 2.8543" |
| Stroke | 3.252" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 0.878 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 138 hp |
| Years | 2011–2016 |
| Bore/stroke character | 0.878 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,252 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.8 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 |
|---|---|---|
| 2011 | 138 hp | LUJ |
| 2012 | 138 hp | LUJ |
| 2013 | 138 hp | LUJ |
| 2014 | 138 hp | LUJ |
| 2015 | 138 hp | LUJ |
| 2016 | 138 hp | LUJ |
1 factory vehicle, 2011–2016. Each year opens that model's engine table.