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Chevrolet LJ5 specs: 111 ci (1.8L) 4-cylinder, 3.307 x 3.228 in (84 x 82 mm) bore and stroke, 22:1 compression. Rated 51 hp, 1981–1986.
The Chevrolet 111ci diesel (LJ5) is close to square: 3.3071" bore against 3.2283" stroke, within 2.4%, which splits the difference between a high-revving layout and a torque layout. The 3.2283" stroke does not reach 4,000 ft/min of mean piston speed until about 7,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 27.8 ci (455 cc).
At 22:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
6 factory variants share these dimensions, rated at 51 hp across 1981–1986.
| Displacement | 111 ci / 1.8 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.2283" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 22:1 |
| Bore/stroke ratio | 1.024 |
| Valvetrain | SOHC |
|---|---|
| Induction | diesel fuel injection |
| Fuel type | diesel |
| Advertised HP | 51 hp |
| Years | 1981–1986 |
| Bore/stroke character | 1.024 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,228 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.8 ci |
| Static compression | 22:1 — 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 |
|---|---|---|
| 1981 | 51 hp | LJ5 |
| 1982 | 51 hp | LJ5 |
| 1983 | 51 hp | LJ5 |
| 1984 | 51 hp | LJ5 |
| 1985 | 51 hp | LJ5 |
| 1986 | 51 hp | LJ5 |