Introduced as a prototype (called simply 'Due Posti') at the Turin Motorshow of 1963, the Mistral (internally the Tipo 109) was a further development of the 3500GT. A shortened and stiffened chassis (using square section tube) was fitted with larger 3.7-litre dohc all-aluminium six cylinder in-line engine (the prototype used the smaller 3500 unit from its predecessor) and a completely new coupe body. At Geneva in the following year the Spider or Convertible version was introduced, which continued to use the 3.5-litre engine from the earlier car. Both cars entered production in 1964.
Both bodies were designed by Frua and built by Maggiora, using light aluminium alloy for the panels (except the rear wings of the Spider which were steel), as well as glass for the large hatchback, which covered a luggage area, the Mistral being a strict two-seater. For the spider there was also available a metal hard-top which included an inclined rear window and small butresses.
Mechanically the Mistral was a refined 3500GT with a similar suspension layout, Girling disc brakes all round (dual circuit with assistance), a Salisbury differential (an LSD was optional) and a similar (shortened) tubular chassis. In 1966 a version using a 4-litre development of the same engine was introduced. Later versions of th Spider used first the 3.7 and then the 4.0-litre engines. All variants used a Lucas fuel injection system and most were produced simultaneously, the smaller engined cars being built alongside the more powerful variants.
The Mistral entered production in 1964 and remained so until 1969, by which time 830 coupes (532 with 3.7-litre and 298 with 4-litre engines) and 125 spyders (65 with 3.5-litre, 20 with 3.7-litre and 40 with 4-litre engines) had been produced.
Engine 3485cc (86x100mm) 6 cyl dohc twin-spark with 235bhp @ 5,500rpm (Spider)
3692cc (86x106mm) 6 cyl dohc twin-spark with 245bhp @ 5,500rpm
4012cc (88x110mm) 6 cyl dohc twin-spark with 255bhp @ 5,200rpm
Suspension front : Independent with double wishbones and coil springs plus anti-roll bar
rear : live axle with leaf springs plus anti-roll bar
wheelbase : 2,400mm
track (front/rear) : 1390mm/1360mm (rear track 1364mm on 4-litre versions)
Brakes discs all round
dual hydraulic circuit with assistance
handbrake operating on rear wheels
Steering worm and sector Transmission 5 speed manual ZF unit (optional automatic)
Salisbury diff, optional self-locking unit
Kerb weight 1430kg (3.7 coupe)
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