Petrol engines
| Model Power | Displacement | Cylinder | Camshaft drive system Timing belt or chain |
|---|---|
| Alfa 166 2.0 Twin Spark 110 kW / 148 hp / 150 PS | 1970 cc | 4 | timing belt |
| Alfa 166 2.0 Twin Spark 114 kW / 153 hp / 155 PS | 1970 cc | 4 | timing belt |
| Alfa 166 2.5 V6 24 V 138 kW / 185 hp / 188 PS | 2492 cc | 6 | timing belt |
| Alfa 166 2.5 V6 24 V 140 kW / 188 hp / 190 PS | 2492 cc | 6 | timing belt |
| Alfa 166 2.0 V6 TB 151 kW / 202 hp / 205 PS | 1996 cc | 6 | timing belt |
| Alfa 166 3.0 V6 24 V 162 kW / 217 hp / 220 PS | 2959 cc | 6 | timing belt |
| Alfa 166 3.0 V6 24 V 166 kW / 223 hp / 226 PS | 2959 cc | 6 | timing belt |
| Alfa 166 3.2 V6 24 V 177 kW / 237 hp / 240 PS | 3179 cc | 6 | timing belt |
Diesel engines
| Model Power | Displacement | Cylinder | Camshaft drive system Timing belt or chain |
|---|---|
| Alfa 166 2.4 JTD 10V 100 kW / 134 hp / 136 PS | 2387 cc | 5 | timing belt |
| Alfa 166 2.4 JTD 10V 103 kW / 138 hp / 140 PS | 2387 cc | 5 | timing belt |
| Alfa 166 2.4 JTD 10V 110 kW / 148 hp / 150 PS | 2387 cc | 5 | timing belt |
| Alfa 166 2.4 JTD 20V 129 kW / 173 hp / 175 PS | 2387 cc | 5 | timing belt |
| Alfa 166 2.4 JTD 20V M-Jet 132 kW / 177 hp / 180 PS | 2387 cc | 5 | timing belt |
| Alfa 166 2.4 JTD 20V M-Jet 136 kW / 182 hp / 185 PS | 2387 cc | 5 | timing belt |
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