Lancia Delta S4 group B (1985)

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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

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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
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1985Season

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

1986Season

Entry		Rally event
Driver Codriver	Team	MC	SVE Entry list	POR	KEN	TdC	GRE	NZ	ARG	FIN	(CdI)	SR	RAC	(Oly)
Henri Toivonen Sergio Cresto	works	1st	eng ine	with drawn		acci dent*
Markku Alén Ilkka Kivimäki	works	cam shaft	2nd	with drawn		with drawn	eng ine	2nd	2nd	3rd		1st	2nd	1st
Miki Biasion Tiziano Siviero	works	68th		with drawn		with drawn	2nd	3rd	1st			3rd
Mikael Ericsson Claes Billstam	works						susp ens ion	4th		5th			eng ine
Jorge Recalde Jorge del Buono	works								4th
Kalle Grundel Benny Melander	works									6th
Dario Cerrato Giuseppe Cerri	works											2nd
Ignacio Sunsundegui Isaez de Buruaga		70th
Fabrizio Tabaton Luciano Tedeschini												with drawn
Paolo Alessandrini Alessandro Alessandrini														6th
Total points ()	148	10	9				9	24	26	19		27	9	15
Statistics
Works starts/finishes	29/18	3/2	2/1	3/0		3/0	3/1	3/3	3/3	3/3		3/3	2/1	1/1
Others starts/finishes	3/2	1/1										1/0		1/1

*See video (or video2)

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Information and articles

Article from 4T 182, 11/1985

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Wikipedia

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Street version

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Source
Henri Toivonen in Monte Carlo '86 (snow)
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Henri Toivonen in Tour de Corse '86 (άσφαλτος)
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Drawings

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Engine

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Rear suspension

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CAD

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