To power the car. Fiat have patented a brand new cylinder head. As a twin turbocharged engine was being used, Fiat had to revise the layout of the cylinder head to improve the suitability for the set up. Normally, the inlet valves are on one side of the layout, exhaust valves on the other, but this makes a twin turbo engine difficult to produce. On the new unit, the four valves of each cylinder are laid out in a cross pattern with the inlet and exhaust valves alternated on each side of the cylinder head. An exhaust manifold can therefore be placed on each side of the engine with the inlet manifolds entering from the center, either independently or combined into one. The system is known as the double reverse flow and, as the intakes combine into one near the valve, leaving just three gas flows for each cylinder, the head has been christened the Triflux.
