The 641 was followed by the 642 in terms of chassis design numbers, but its official name was the F1-91. This was still a development rather than a brand-new car as its general layout was the same, even though a host of modifications had been made, including a longer wheel base and longer flanks with straight central sections. The suspension design remained unchanged with a push-rod spring action system, torsion bars vertical to the front axle and helicoid springs on the rear axle, but many elements were redesigned to vary the geometries. The engine still had five valves per cylinder as pneumatic springs had not yet been developed and the intake trumpet adjustment system was only introduced at the end of the season.

Nonetheless any illusions the Scuderia had about staying at the top of the pile were soon smashed. The F1-91 and perhaps even the team were nowhere near as competitive as their direct rivals, McLaren and Williams, who dominated the scene. In fact, Ferrari only managed half of the previous season’s points as neither Prost nor his young fellow countryman Jean Alesi won a race. The year came to a stormy end with serious in-fighting at the Scuderia which led to Prost being replaced in the last race by Morbidelli. On a brighter note, however, the end of the season also saw Luca di Montezemolo return to Maranello as President and CEO of Ferrari.

Type rear, longitudinal 65° V12
Bore/stroke 86 x 50.2 mm
Unitary displacement 291.60 cc
Total displacement 3499.22 cc
Compression ratio 13.3 : 1
Maximum power 533 kW (725 hp) at 14,500 rpm
Power per litre 207 hp/l
Maximum torque -
Valve actuation twin overhead camshafts per bank, five valves per cylinder
Fuel feed Weber-Marelli electronic indirect injection
Ignition electronic, single spark plug per cylinder
Lubrication dry sump
Clutch multi-plate
Frame Kevlar and carbon-fibre composite monocoque
Front suspension independent push-rod, torsion bar springs, twin wishbones, telescopic shock absorbers, anti-roll bar
Rear suspension independent push-rod, twin wishbones, coil springs over horizontally-mounted telescopic shock absorbers
Brakes discs
Transmission electro-hydraulic 7-speed + reverse
Steering rack-and-pinion
Fuel tank capacity 215 litres
Front tyres 25.0-10.0-13
Rear tyres 26.0-15.0-13