See other engines in this family
Alfa Romeo Bosch Motronic 2.0 specs: 120 ci 4-cylinder, 84 x 88.5 mm (3.3071 x 3.4843 in) bore and stroke. Built 1990–1994. Used in the Alfa Romeo Spider.
The Alfa Romeo Bosch Motronic 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. 5 factory variants share these dimensions across 1990–1994.
| Displacement | 120 ci |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.4843" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.949 |
| Fuel type | gas |
|---|---|
| Years | 1990–1994 |
| 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 |
|---|---|---|
| 1990 | — | Bosch Motronic 2.0 |
| 1991 | — | Bosch Motronic 2.0 |
| 1992 | — | Bosch Motronic 2.0 |
| 1993 | — | Bosch Motronic 2.0 |
| 1994 | — | Bosch Motronic 2.0 |
1 factory vehicle, 1990–1994. Each year opens that model's engine table.