E pensare che 20 anni fa alla LANCIA producevano questi mostri:
The Delta S4 program began in 1983 and the first prototype was ready in June 1984. Designed to replace the 037, the S4 followed Audi and Peugeot in the move to four wheel drive. A tubular space frame chassis was adopted, the four wheel drive system used three differentials (Ferguson type viscous coupling limited slip diff in the centre and mechanical self-locking types front and rear), and an all new engine was designed by Abarth.
This engine had a capacity of 1759cc, used an alloy cylinder head and cylinder block, had four valves per cylinder, twin overhead camshafts, fuel injection (with two injectors per cylinder) and most interestingly both a turbocharger and a supercharger with twin air-to-air intercoolers. A power of 480bhp was produced at 8400rpm.
The S4 was homologated on 1st November 1985 and made it's World Championship debut on the RAC in that same month where it finished first and second. It continued to score several victories in 1986 but was beaten to the championship by Peugeot. After the tragic death of Toivonen and Cresto in the Tour de Corse of that year Group B was banned, and thus the S4 ended it's career somewhat prematurely.
ECV1
First displayed at the Bologna Motorshow in 1986, the ECV1 (Experimental Composite Vehicle) was Lancia's first prototype Group S car, a further development of the S4. It featured heavy use of composite materials and a 1759cc twin turbo engine producing 600bhp. With the demise of Group B it never saw action.
ECV2
The ECV2 was a further development of the theme, with an all new bodywork which was aerodynamically optimised, the major change being the relocation of the engine coolant and lubricant radiators to the front of the car. The body construction continued the theme of the ECV1, using aluminium honeycomb, carbon fibre, glass fibre and kevlar in various positions. The weight distribution was also improved with respect to the previous model.
The engine remained 1759cc with two turbochargers, but the cylinder head design changed significantly and the turbochargrs were used sequentially (see below). The intercoolers also adopted water cooling. The drive system remained essentially as in the S4, with some improvements, a three-differential design with 30% of the torque at the front and the remaining 70% at the rear.
Ventilated disc brakes, power assisted steering and double wishbone suspension all round were also used.
The wheelbase was 2440mm, the tracks (front/rear) 1500mm/1520mm and kerb weight 910kg.
Triflux Engine
The 1800 power unit of the ECV2 was known as the triflux. This was due to the design which had one exhaust and one inlet valve on each side of the cylinder head, with the resulting twin exhaust manifolds each feeding one turbocharger. At low engine speeds one turbocharger exhaust was shut-off, forcing all the exhaust gases through one unit and thus providing good low speed performance. As the engine speed rose, the second turbocharger was gradually introduced, until at high engine speeds both tu
Si parla di un motore con cilindrata di 1759cc con 600hp :?:
