Alfa Romeo Alfasud Sprint 6C – Gr.B Prototype

Published on: Jan 18, 2016 @ 15:43
Originally Published in: 2015 (old website)
(C) Jay Auger - website owner & author
Notice: Any form of duplication methods (including but not limited to copy/paste of text and screen capture) of the website's content is strictly forbidden.

alfasud_sprint_6c_prototype_1_1.jpg

In 1980, when the FISA officially approved the new Group B class due to begin in 1982, many manufacturers wanted to jump onto the popular rally scene. Alfa Romeo’s first bid for a Group B car was with the Alfasud Sprint 6C and the project timetable was originally set for it to be ready to compete for the 1983 season. The Autodelta redesigned Sprint 6C prototype sported very stylish new front and rear sections, wider fender flares, louvres, and a lip spoiler. Two prototypes are rumoured to have been built; one more inclined towards the specifications of a road car and the other a bit more evolved towards racing.

What is most special about the Sprint 6C is that the Alfa Romeo engineers placed the drivetrain from the GTV6 behind the front seats, quite similarly to Renault’s “quick recipe for success”, the R5 Turbo, that converted a front engine car to a mid-engine rear wheel drive layout. The GTV6 engine had already proven itself in the European Touring Car series, developing around 220 BHP, so it was the logical choice to power the new prototype rally car.

The “first” Group B prototype was presented to the press at the Monza circuit and subsequently to the public at the 1982 Paris Auto Show. Rumour has it that this prototype was not functional and for publicity purposes only: which is substantiated by the odometer that still sat at zero.

The “two” prototypes can be differentiated from the other in the following ways; the “first” prototype has a black grille, two small round door mirrors, black rear screen louvers, a spoiler with “Sprint 6C” decals, and a large oval center exhaust pipe, while the “second” prototype has a chromed center grille, auxiliary lamps fitted underneath the front bumper,  one large squared door mirror (driver side only), molded body colored rear screen louvers, a spoiler with an Alfa Romeo badge also featuring cooling intakes (for an oil cooler and engine air intake), different license plate position with a meshed vent (for the oil cooler), recessed tail lights, a redesigned rear bumper cover with auxiliary stop lamps, and twin exhaust pipes.

Both version featured a “thermo-acoustic” glass partition between the cabin and rear engine bay. The louvers effectively replaced the rear screen and provided much needed venting. However, the interior of the “second” prototype was barer and featured racing seats and harnesses, which made it more suited to be a true competition model.

alfa_romeo_alfasud_sprint_6c_prototype_int

The “second” prototype was said to be fully functional although it remained in an early unrefined test bed form. The mid-mounted engine and longitudinal rear transaxle can clearly be seen, including an all new suspension setup that included a rally style twin damper setup paired with dual wishbones:

alfarommusetre-14.jpg

Although the potent V6 engines of the touring cars were of 2480 cc, Alfa had planned to homologate the 6C with a revised displacement of 2503 cc, therefore putting it in the 2500~2999 cc Group B class regulations instead. This seemed like a bad move at first but it was actually quite cunning as the 6C weighed in at 990 kg (2,180 lbs) and better matched the 960 kg (2,115 lbs) minimum weight of that particular class. The higher engine class would allow the use of wider tires and the possibility of the “evolution” engines (that would power the rally cars) to be increased up to 2999 cc for much more power and torque.

The homologation 2.5L road car’s engine would have a rating of 160 BHP but the “evolution” 3.0L engines were planned to produce anywhere between 240 and 300 BHP, both normally aspirated. It is most likely that the prototype, which was in an early stage of development, featured the normal 2492 cc GTV6 engine rather than the planned homologation 2503 cc one.

alfarommusetre-13.jpg

However, for reasons publicly unknown to this day, the Alfa Romeo board of directors decided not to go forward with the Sprint 6C project and settled with the more readily available Alfetta Turbodelta for Group B homologation instead. It must be noted that Alfa Romeo was undergoing financial troubles at the time and conversion costs for the required 200 homologation cars might have been too much. Sadly, even though all agree that the 6C could have been the “Italian R5 Turbo” and be a commercial success, the cancellation of the project robbed the world from a spectacular machine that would have sat very well parked alongside a Lancia 037 Stradale in the Tuscany countryside.

Insiders disagree if one or two cars were built since the first prototype shown could have been upgraded to the second prototype, and some say that even more were built, but proof has yet to be presented.

SPECIFICATIONS

Group/Class B/12 PROTOTYPE
Year of conception 1982  # built: 1 or 2
Engine
Type GTV6, V6, SOHC 12v, gas mid-mounted, longitudinal, 60° V6
Displacement 2492 cc planned for homologation: 2503 cc
Compression ratio 9.0:1
Output power – torque 158 HP @ 5600 RPM 157 lb-ft @ 4000 RPM
Materials block: N/A cylinder head: N/A
Aspiration
  • Normal / Natural
  • Bosch L-Jetronic fuel injection
Ignition N/A
Cooling system water-cooled
Lubrication system N/A N/A
Transmission
Type rear wheel drive 5 speed manual
Gearbox ratios N/A N/A
Differential ratios N/A ZF longitudinal transaxle
Clutch N/A
Chassis-body
Type based on “Sprint” model steel monocoque chassis, 3 door hatchback, steel bodyshell with polyester bonnet, rear hatch, and bumper covers
Front suspension Independent, double-wishbone, coilover hydraulic damper
Rear suspension Independent, double-wishbone, dual coilover hydraulic dampers
Steering system N/A N/A
Brakes Front & Rear: vented discs N/A
Dimensions
length: 4024 mm (158.4 in) width: – mm (- in) height: – mm (- in)
wheelbase: 2455 mm (96.7 in) front track: – mm (- in) rear track: – mm (- in)
Rims – tires Speedline 15 inch
  • Pirelli P700
  • Front: 205/50VR15
  • Rear: 225/50VR15
Dry/Unladen Weight 990 kg (2180 lb)
Weight/power N/A
Fuel tank N/A

ANECDOTE

Giocattolo Group B
Giocattolo “Group B”

In 1986, years after the Sprint 6C project cancellation by Alfa Romeo, it was somewhat revived by Barry Lock of Giocattolo Motori (a short lived auto company out of Australia). The company bought a few Sprint chassis to recreate the original 6C prototypes. However, the GTV6 engines were expensive to import and were subsequently replaced by Holden 5.0L V8s which were cheaper and locally available. The resulting car was simply named the “Group B”. Fifteen cars were built until the company folded just three years later in 1989.

VIDEOS


(C) Article by Jay Auger – website owner & author

  • Images & videos are the property of their original owners

Do you want to contribute information or pictures to this page? Please feel free to do so by using this CONTACT form!

Advertisements

WELCOME TO THE ENCYCLOPEDIA OF THE GOLDEN ERA OF RALLYING

Advertisements