The 2.5-liter V6 Alfa Romeo AR67301 engine was assembled at the Arese plant from 1992 to 1997 and was installed only on charged modifications of the very popular 155 model in the European market. The same power unit was installed on the 166 sedan, but under its own index 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
- On the engines of the first years, the cams of the exhaust camshaft wore out rather quickly.
- Another weak point of this power unit is the valve guides.
- Also on specialized forums, the unreliable hydraulic timing belt tensioner is often scolded.
- A lot of trouble here is caused by constant leaks, and especially on cylinder head gaskets.
- The remaining problems are related to air leaks in the intake and engine overheating.
