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Audi NF specs: 2.3L (141 ci) 5-cylinder, 82.5 x 86.4 mm (3.2480 x 3.4016 in) bore and stroke. Built 1987–1988. Used in the Audi 5000.
The Audi 141ci (NF) is close to square: 3.248" bore against 3.4016" stroke, within 4.5%, which splits the difference between a high-revving layout and a torque layout. The 3.4016" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 5 cylinders displaces 28.2 ci (462 cc).
2 factory variants share these dimensions across 1987–1988.
| Displacement | 141 ci / 2.3 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.4016" |
| Cylinders | 5 |
| Compression ratio | 10–10.3:1 (published figures vary) |
| Bore/stroke ratio | 0.955 |
| Fuel type | gas |
|---|---|
| Years | 1987–1988 |
| Bore/stroke character | 0.955 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.2 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 |
|---|---|---|
| 1987 | — | NF |
| 1988 | — | NF |
1 factory vehicle, 1987–1988. Each year opens that model's engine table.