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Alfa Romeo Bosch L-Jetronic 2.0 specs: 120 ci 4-cylinder, 84 x 88.5 mm (3.3071 x 3.4843 in) bore and stroke. Built 1982–1989. Used in the Alfa Romeo Spider.
The Alfa Romeo Bosch L-Jetronic 2.0 is undersquare — the 3.4843" stroke exceeds the 3.3071" bore by 5.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4843" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.0 ci (492 cc).
It is one of 3 engines in the Alfa Romeo 120ci family, all of them 120 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions across 1982–1989.
| Displacement | 120 ci |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.4843" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.949 |
| Fuel type | gas |
|---|---|
| Years | 1982–1989 |
| Bore/stroke character | 0.949 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,484 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.0 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 |
|---|---|---|
| 1982 | — | Bosch L-Jetronic 2.0 |
| 1983 | — | Bosch L-Jetronic 2.0 |
| 1984 | — | Bosch L-Jetronic 2.0 |
| 1985 | — | Bosch L-Jetronic 2.0 |
| 1986 | — | Bosch L-Jetronic 2.0 |
| 1987 | — | Bosch L-Jetronic 2.0 |
| 1988 | — | Bosch L-Jetronic 2.0 |
| 1989 | — | Bosch L-Jetronic 2.0 |
1 factory vehicle, 1982–1989. Each year opens that model's engine table.