Only charged versions of the highly sought-after 155 model in the European market were equipped with the 2.5-liter V6 Alfa Romeo AR67301 engine, which was assembled at the Arese plant between 1992 and 1997. The 166 sedan had the same power unit installed, but it was identified by its own number, AR66201.
The Busso V6 series includes: AR34102, AR32405, AR67301, AR16105.
Specifications
| Production years | 1992-1997 |
| Displacement, cc | 2492 |
| Fuel system | distributed injection |
| Power output, hp | 165 |
| Torque output, Nm | 216 |
| Cylinder block | aluminum V6 |
| Block head | aluminum 12v |
| Cylinder bore, mm | 88 |
| Piston stroke, mm | 68.3 |
| Compression ratio | 10.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 10W-40 |
| Engine oil capacity, liter | 6.0 |
| Fuel type | petrol |
| Euro standards | EURO 2 |
| Fuel consumption, L/100 km (for Alfa Romeo 155 1995) — city — highway — combined |
14.0 7.3 9.3 |
| Engine lifespan, km | ~240 000 |
| Weight, kg | 180 |
The engine was installed on:
- Alfa Romeo 155 (Type 167) in 1992 – 1997.
Disadvantages of the Alfa Romeo AR67301 engine
The exhaust camshaft’s cams deteriorated rather rapidly on the engines from the early years.
The valve guides are another flaw in this power unit.
The unreliable hydraulic timing belt tensioner is frequently chastised on specialized forums.
Constant leaks, particularly on cylinder head gaskets, are a major source of trouble here.
The remaining issues are connected to engine overheating and intake air leaks.