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Seven engines, seven eras

Alfa rarely had the biggest engine in the class. It almost always had the most interesting one: aluminium, twin overhead camshafts and revs, while the competition was still relying on capacity.

Why they sound like that

Three decisions, repeated for eighty years

Between the 8C of 1931 and today's 2.9 V6 there is almost nothing in common mechanically. What they share are three habits Alfa rarely abandons.

Aluminium before anyone: The Twin Cam arrived in 1954 with an all-aluminium block in a car for the general public — at a time when the competition kept casting iron for another two decades.
Two camshafts, not one: Twin overhead cams are a racing solution. Alfa put them in a family saloon because its engineers refused to design two different kinds of engine.
Revs instead of capacity: The 33 Stradale drew 230 hp from two litres in 1967 and spun to 10,000 rpm. The logic is identical in the 1.3-litre Giulietta: power is found further up the scale.
The sound is not an accident: The six separate intake runners of the Busso V6 are laid out like organ pipes. Their shape is an engineering choice, but the result is recognisable from a hundred metres.