Fiat 131 Abarth group 4 (1976)
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Home » Rally Cars » Fiat 131 Abarth

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Abarth used G numbers to identify the cars. The number is kind of a works team serial number.
Drifting: see video
In rallies: see video

Specifications

400 units built
Click here for 131 Racing
Source1, Source2

Group/Class 4/3 Homologation number: 647
Years active 1976-1981 Homologation start: 1/4/1976
Homologation end: 31/12/1981
Engine
Type Fiat Twin Cam (Lambredi), Type 232CIG, 131AR.000, straight 4cyl, 4 stroke, petrol engine located front longitudinal
Capacity 1995 cc WRC: 1995 cc
Bore x Stroke (mm) 84.0 x 90.0
Compression ratio 10.3:1, 7/1977+: 11.0:1
Output power - torgue 140 HP @ 6400 rpm
215 - 230 HP / 7000 rpm		 17.5 kgm @ 3600 rpm
23.0 kgm (226 Nm) / 5600 rpm
Main bearings forged steel crankshaft with 5 main bearings 53mm main journal diameter, and 50.8 mm big end journal diameter connecting rod length between centers 145mm, 53.9mm big end bearing tunnel diameter, alluminium alloy piston with 37.7mm compression height
Materials block: cast iron, 229 mm deck height cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers
Cams/valves 2 overhead camshafts (DOHC), belt driven 4 valves/cyl. - 16 valves total. 34.5mm inlet valves diameter, 28.5mm exhaust valves diameter. 2 coil springs per valve
Aspiration natural, 1 x double Weber 34 ADF carburetor, Bosch-KugelFischer mechanical fuel injection
Ignition with contact breakers and Abarth spark plugs, 7/1977+: Magneti Marelli electronic with transistor, firing order 1-3-4-2 12V-24Ah-150A battery, 12V-1,2kW starter, 12V-1000W alternator
Cooling system jacketed watercooled with pump, radiator, 280 mm diameter-4 blades fan and thermostat 7.6 lt
Lubrication system wet sump. 1977+: dry sump with oil cooler 4 lt, 6.6 lt, 1977+: 15 lt
Transmission
Type rear wheel drive ZF Colotti T.209, 1/1977+: Cima 5-speed manual gearbox
Gearbox ratios constant: 1.269/1 (33/26)
1st: 3.612/1 (37/13)
2nd: 2.045/1 (29/18)
3rd: 1.357/1 (31/29)
4th: 1.000/1 (-)
5th: 0.870/1 (24/35)
R: 3.244/1 (46/18)		 constant: 1.043/1 (24/23)
1st: 2.156/1 (31/15)
2nd: 1.565/1 (27/18)
3rd: 1.242/1 (25/21)
4th: 1.000/1 (-)
5th: 0.802/1 (20/26)
R: 2.666/1 (46/18)		 constant: 1.043/1 (24/23)
1st: 2.021/1 (31/16)
2nd: 1.537/1 (28/19)
3rd: 1.185/1 (25/22)
4th: 1.000/1 (-)
5th: 0.876/1 (21/25)
R: 2.666/1 (46/18)		 1977+, constant: 1.045/1 (23/22)
1st: 2.654/1 (33/13)
2nd: 1.895/1 (29/16)
3rd: 1.568/1 (27/18)
4th: 1.244/1 (25/21)
5th: 1.000/1 (-)
R: 2.671/1 (46/18)
Diffrential ratio 6.83/1 (41/6), 6.42/1 (45/7), 6.143/1 (43/7), 5.375/1 (43/8), 4.875/1 (39/8), 4.625/1 (37/8), 4.444/1 (40/9), 4.30/1 (43/10), 3.90/1 (39/10), 3.63/1 (40/11)
1977+: 5.714/1 (40/7)
1978+: 5.125/1 (41/8)		 hypoid spiral bevel gears limited slip rear differential
Clutch dry single plate, 230mm diameter
Chassis-body
Type steel monocoque 131AR chassis with roll-cage. 2 door saloon steel bodyshell with plastic extended wheel arches and front/rear spoilers
Front suspension McPherson strut with lower transverse arm and stabilizer, progressive coil springs and telescopic shock absorbers
Rear suspension mcpherson strut with lower semi-trailing L wishbone and 1 transverse control rod, progressive coil springs (220/110lbs), and telescopic shock absorbers (see picture)
Steering system rack and pinion (no servo) 3.4 or 2.85 turns lock to lock
Brakes solid discs all around 227mm diameter, front 1 x 48mm diameter piston caliper, rear 1 x 34mm diameter piston caliper.
Front ventilated disks 300/275 mm diameter with 2 piston calipers, or 2 calipers x 2 piston calipers per disk. Rear ventilated disks 252mm diameter with 4 or 2 piston calipers		 dual circuit with vacuum servo, adjustable ratio split front to rear
Dimensions
length: 4.181 m (164.6") width: 1.720 m (67.7"), group 4: +100mm height: 1.360 m (53.5")
wheelbase: 2.490 m (98.0") front track: 1.460 m (57.5") - 1.520 m (59.8") rear track: 1.460 m (57.5") - 1.492 m (58.7")
Rims - tires gravel: 7" x 15", tarmac: front 10" x 15" and rear 11" x 15" MS 35 185/70-15 or Pirelli P7 205/60VR-15, P7 285/35VR15
Weight 850 kg, 980 - 1020 kg 50/50% front to rear distribution
Fuel tank 50 lt. 1979+: 60 - 90 lt

Results in WRC

Races

Works team:

  • works: Olio Fiat (1976-1977)
  • works1: Fiat Alitalia (1978-1979)
  • works2: Wreath Fiat (1980-1981)
Season
Entry Rally event
Driver
Codriver		 Team MC SVE
Entry list		 POR KEN GRE MAR FIN S.R TdC RAC
Markku Alén
Ilkka Kivimäki		 works 12th
Markku Alén
Ilkka Kivimäki
G16		 works 1st* acci dent
Markku Alén
Ilkka Kivimäki
G14		 works diff eren tial
Roberto Cambiaghi
Emanuele Sanfront
G11		 works diff eren tial
Maurizio Verini
Ninni Russo
G11		 works gear box
Maurizio Verini
Ninni Russo		 works diff eren tial
Maurizio Verini
Ninni Russo
G8		 works dnf
Fulvio Bacchelli
Francesco Rossetti		 works susp ens ion
Fulvio Bacchelli
Francesco Rossetti
G12		 works acci dent
Fulvio Bacchelli
Francesco Rossetti
G7		 works 11th
Total points
()		 10 10
Statistics
Works starts/finishes 10/2 3/1 4/0 3/1
Others starts/finishes 1/1 1/1

*Autonovo Oy entry

Information and articles

Article from 4T 129, 6/1981

Click here

Article from 4T 82, 7/1977

Click here

Fiat_131_Abarth_010.jpg Source
1975_fiat_131-pic-8961119613944774608.jpeg Source

Drawings

14749d1112292474-fiat-lancia-twin-cam-engine-history-fiat-131-abarth.gif Source
fiatabarth131.jpg
131Abarthlinesmall.jpg

Suspension

131frnt.jpg Source
sx6.jpg
page revision: 182, last edited: 07 Feb 2019 07:31
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