Lancia Delta S4 group B (1985)
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Home » Rally Cars » Lancia Delta S4
ixo-lancia-delta-s4-h-toivonen--n-wilson-rac-rally.jpg Source Development chain
1984: Lancia Delta S4
1987: Lancia ECV
1988: Lancia ECV2
Development level
Group B
Group A
Group N
Production

On board: see video
S4 rally history: video1 (begining), video2.1(RAC '85), video2.2 (RAC '85 & Monte '86), video2.3 (Monte '86), video3 (Sweden '86), video4 (Portugal '86), video5.1 (Corsica '86), video5.2 (Corsica '86), video5.3 (Corsica '86), video6 (Acropolis '86), video7 (New Zealand '86), video8.1 (Argentina '86), video8.2 (1000 lakes '86), video9 (San Remo '86), video10 (RAC '86), video11 (Olympus '86), video12

Specifications

Group/Class B/12 Homologation number: B 276
Years active 1985 - 1986 Homologation start: 1/11/1985
Engine
Type Abarth 233 ATR 18S, straight 4cyl (see picture), 4 stroke, petrol engine located middle longitudinal
Capacity 1759 cc WRC: x 1.4 = 2463 cc
Bore x Stroke (mm) 88.5 x 71.5
Compression ratio 7.1:1
Output power - torgue 410 - 450 HP / 8000 rpm
(550 HP / 8400 rpm)
46.0 kgm (451 Nm) / 5000 rpm
Main bearings 5
Materials block: aluminium alloy cylinderhead: aluminium alloy
Cams/valves 2 overhead camshafts (DOHC), belt driven 4 valves/cyl. - 16 valves total
Aspiration KKK K27 turbocharger combined with Abarth Roots Supercharger with 2 intercoolers (see picture), IAW Weber-Magneti Marelli multipoint electronic fuel injection pressure: 2.2 bar
Ignition Weber-Magneti Marelli electronic
Cooling system watercooled
Lubrication system dry sump
Transmission
Type four wheel drive 5 speed ZF gearbox
Gearbox ratios 1st: 2.50/1
2nd: 1.579/1
3rd: 1.115/1
4th: 0.862/1
5th: 0.71/1
R: 2.462/1
Diffrential ratio front/rear 2.643/1, center 1.905/1 (Total 5.035/1) helical gears ferguson viscous coupling epicyclic center differential with adjustable distribution 25%-75% to 40%-60% front to rear and 2 outputs, 1st to spiral bevel gear limited slip front differential and 2nd to spiral bevel gear limited slip rear differential
Clutch dry, double disk
Chassis-body
Type composite body panels on tubular Chrome-Molybdenum steel spaceframe
Front suspension double unequal wishbones, coil spring, telescopic hydraulic shock absorbers, anti-roll bar
Rear suspension double unequal wishbones, coil spring, twin telescopic hydraulic shock absorbers, anti-roll bar
Steering system pneumatic power assisted rack and pinion 2.5 turns lock to lock
Brakes front and rear ventilated disks 300mm diameter, 4 piston calipers all around dual circuit with servo, adjustable ratio split front to rear
Dimensions
length: 3.990 m (157.1") width: 1.880 m (74.0") height: 1.360 m (53.5")
wheelbase: 2.440 m (96.1") front track: 1.510 m (59.4") rear track: 1.535 m (60.4")
Rims - tires 8" - 10" x 16" Pirelli 205/55 VR 16, front 235/660 - 16, rear 290/660 - 16
Weight 900-1000 kg front/rear distribution 45% - 55%
Weight/power 2.1 kg/HP
Fuel tank 70 - 110 lt

Results in WRC

Statistics

1985 1986 Total
Works
Races/wins 1/1 11/4 12/5
Entries/finishes 2/2 29/18 31/20 (64.5%)
Others
Races 0
Entries/finishes 3/2 3/2 (66.7%)
Total WRC results
Races/wins 1/1 8 12/5
Entries/finishes 2/2 32/20 34/22 (64.7%)
Total points 19 148 167
(13.917 per race)
(4.911 per entry)

Races

Works team: Martini Lancia
Click on tabs
Season
Entry Rally event
Driver
Codriver
Team M.C SVE
Entry list
POR KEN TdC GRE N.Z ARG FIN S.R (CdI) RAC
Henri Toivonen
Neil Wilson
works 1st
Markku Alén
Ilkka Kivimäki
works 2nd
Total points
()
19 19
Statistics
Works starts/finishes 2/2 2/2

Information and articles

Article from 4T 182, 11/1985

Click here

Wikipedia

Click here

Street version

Click here

62667fa4e1a6c39617f7f54ece373edd.jpg Source
Henri Toivonen in Monte Carlo '86 (snow)
tour-de-corse-1986-lancia-delta-s4-toivonen.png Source
Henri Toivonen in Tour de Corse '86 (άσφαλτος)
Lancia_Delta_S4_006.JPG Source
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Drawings

1024_s4_cutaway.jpg Source
lancia-delta-s4.gif Source
Lancia_Delta_S4_by_kaka_22.jpg Source
lancia-delta-s4.jpg Source

Engine

lanciadeltas41986227bhp.jpg Source

Rear suspension

lanciadeltas4rearsuspen.jpg Source

CAD

lanciaS4_02.jpg Source
lanciaS4_03.jpg Source
s4-cad.png Source
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