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Porsche 183ci (1992–1995) specs: 3.0L (183 ci) 4-cylinder, 104 x 88 mm (4.0945 x 3.4646 in) bore and stroke, 11:1 compression. Rated 240 hp, 1992–1995.
The Porsche 183ci (1992–1995) is oversquare — the 4.0945" bore exceeds the 3.4646" stroke by 18.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 45.8 ci (750 cc).
11:1 is high enough that pump premium or better is normally required.
It is one of 3 engines in the Porsche 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 240 hp across 1992–1995.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 4.0945" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.182 |
| Fuel type | gas |
|---|---|
| Advertised HP | 240 hp |
| Years | 1992–1995 |
| Bore/stroke character | 1.182 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 45.8 ci |
| Static compression | 11:1 — 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 |
|---|---|---|
| 1992 | 240 hp | — |
| 1993 | 240 hp | — |
| 1994 | 240 hp | — |
| 1995 | 240 hp | — |
1 factory vehicle, 1992–1995. Each year opens that model's engine table.