The controversial story of the 4-cylinder turbo F1

The era of turbo engines took Formula 1 by storm in the late 1960s, and for the entire following decade, technologies and different set-ups succeeded each other in a continuous crescendo of power that peaked beyond the 1000 HP/litre threshold. For Alfa Romeo, the last evolution came with a 4-cylinder in-line biturbo engine that was tested for a long time but never actually hit the track, due also to the termination of the agreement with team Ligier.