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Nissan L20B specs: 2.0L (119 ci) 4-cylinder, 85 x 86 mm (3.3465 x 3.3858 in) bore and stroke, 8.5:1 compression. Rated 110 hp, 1975–1980.
The Nissan L20B is close to square: 3.3465" bore against 3.3858" stroke, within 1.2%, which splits the difference between a high-revving layout and a torque layout. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 29.8 ci (488 cc).
8.5:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Nissan 119ci family, all of them 119 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions, rated at 110 hp across 1975–1980.
| Displacement | 119 ci / 2 L |
|---|---|
| Bore | 3.3465" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.5:1 |
| Bore/stroke ratio | 0.988 |
| Fuel type | gas |
|---|---|
| Advertised HP | 110 hp |
| Years | 1975–1980 |
| Bore/stroke character | 0.988 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.8 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1975 | 110 hp | L20B |
| 1976 | 110 hp | L20B |
| 1977 | 110 hp | L20B |
| 1978 | — | L20B |
| 1978 | 110 hp | L20B |
| 1979 | — | L20B |
| 1979 | 110 hp | L20B |
| 1980 | — | L20B |
3 factory vehicles, 1975–1980. Each year opens that model's engine table.