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
Specifications
200 units builtClick here
Group/Class | B/12 | Homologation number: B276 | |
Years active | 1985 - 1986 | Homologation start: 1/11/1985 Homologation end: 11/12/1991 |
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Engine | |||
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Type | Abarth 233 ATR 18S, straight 4 cyl (see picture), 4 stroke, petrol engine | located centrally in front of rear axle longitudinally with 20o inclination to the drivers side (LHD) | |
Capacity | 1759.3 cc | WRC: x 1.4 = 2463 cc 1988: x 1.7 = 2991 cc |
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Bore x Stroke (mm) | 88.5 x 71.5 | ||
Compression ratio | 7.1:1 | ||
Output power - torgue | 410 - 450 HP / 8000 rpm (480-550 HP / 8400 rpm) |
46.0 kgm (451 Nm) / 5000 rpm | |
Main bearings | forged steel crankshaft with 5 main bearings 52.9mm diameter | connecting rod length between centers 140mm, big end bearing tunnel diameter 51.35mm | |
Materials | block: aluminium alloy | cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers | |
Cams/valves | 2 overhead camshafts (DOHC), belt driven | 4 valves/cyl. - 16 valves total. 35.6mm inlet valve diameter, 30.6mm exhaust valve diameter. 51.16o angle between inlet valves axis and exhaust valves axis | |
Aspiration | KKK K26 53269707040 (12 blades steel turbine 54.5/64.4mm in/out diameter, 12 blades aluminium compressor 46.2/66mm diameter) turbocharger, EVO: KKK K27 (12 blades steel turbine 64/76.2mm in/out diameter, 12 blades aluminium compressor 57.4/82mm diameter) turbocharger combined with Abarth Roots Supercharger with 2 intercoolers (see picture), IAW Weber-Magneti Marelli multipoint electronic fuel injection | pressure: 2.2 bar (560 HP) | |
Ignition | Weber-Magneti Marelli electronic | ||
Cooling system | jacketed watercooled with pump, front and rear radiators, fan and thermostat | ||
Lubrication system | dry sump with 3 stage pump | ||
Transmission | |||
Type | four wheel drive | Hewland, 5 speed manual gearbox | |
Gearbox ratios | 1st: 2.50/1 (35/14) 2nd: 1.579/1 (30/19) 3rd: 1.115/1 (29/26) 4th: 0.862/1 (25/29) 5th: 0.709/1 (22/31) R: 2.461/1 (32/15 x 15/13) |
1st: 2.385/1 (31/13) 2nd: 1.706/1 (29/17) 3rd: 1.350/1 (27/20) 4th: 1.136/1 (25/22) 5th: 1.000/1 (26/26) R: 2.500/1 (35/16 x 16/14) |
1986: 1st: 2.538/1 (33/13) 2nd: 1.706/1 (29/17) 3rd: 1.250/1 (25/20) 4th: 1.000/1 (23/23) 5th: 0.840/1 (21/25) R: 2.500/1 (35/16 x 16/14) |
Diffrential ratio | Front/rear 2.643/1 (37/14), Center differential 2.000/1 (42/21), 1.773/1 (39/22), 1.905/1 (40/21), 2.000/1 (40/20), 2.263/1 (43/19), 2.278/1 (41/18). 1986: center differential 2.100/1 (42/20), 2.150/1 (43/20) |
helical gears ferguson viscous coupling epicyclic center differential with adjustable distribution 25%-75% to 40%-60% front to rear and 2 outputs, 1st to ZF spiral bevel gear limited slip front differential and 2nd to ZF spiral bevel gear limited slip rear differential | |
Clutch | dry, double disk | ||
Chassis-body | |||
Type | chrome-molybdenium tubular space frame with carbon fiber reinforcements chassis, front and rear tubular suspension subframes. 2 door hatchback/coupe carbon fiber composite bodyshell. Bonnet opening behind the front-mounted water radiator with Gurney flap, front splitter and winglets moulded into the front bumper panel, flexible front skirt, and rear deck lid wing that featured both a full aerofoil wind section twinned with a deflection spoiler. The door construction style was brought from the 037 with a hollow shell all-Kevlar construction that had no inner door skin, no door handle or window winder. The door was opened with a small loop and the windows were fixed perspex with small sliding panels to allow ventilation | ||
Front suspension | double unequal wishbones, coil spring, telescopic hydraulic shock absorbers, anti-roll bar | ||
Rear suspension | double unequal wishbones, separate spring, twin telescopic hydraulic shock absorbers, anti-roll bar | ||
Steering system | rack and pinion with or without pneumatic power assisted | 2.5 turns lock to lock, 14.4/1 ratio | |
Brakes | front and rear ventilated disks 300mm diameter, front 2 aluminium piston calipers 48mm diameter or 4 aluminium piston calipers 42+40mm diameter (1 pair of pistons is 42mm diameter, and the other is 40mm diameter), rear 2 aluminium piston calipers 32/42/48mm diameter. 1986: front and rear 4 aluminium piston calipers 44+36mm diameter (1 pair of pistons is 44mm diameter, and the other is 36mm diameter) |
dual circuit with servo, adjustable ratio split front to rear | |
Dimensions | |||
length: 3.990 m (157.1") EVO: 4.092 m (161.1") |
width: 1.785 m (70.3") EVO: 1.860 m (73.2") |
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% | |
Fuel tank | 80, 70 - 110 lt |
Results in WRC
Statistics
1985 | 1986 | Total | |||||
Works | |||||||
Races/wins | 1/1 | 11/4 | 12/5 | ||||
Entries/finishes | 2/2 | 28/17 | 30/19 (63.3%) | ||||
Others | |||||||
Races | 0 | ||||||
Entries/finishes | 4/3 | 4/3 (75.0%) | |||||
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
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 SE038-202 |
works | 1st | |||||||||||||
Markku Alén Ilkka Kivimäki SE038-207 |
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

Henri Toivonen in Monte Carlo '86 (snow)

Henri Toivonen in Tour de Corse '86 (άσφαλτος)



Drawings




Engine

Rear suspension

CAD



page revision: 100, last edited: 02 Oct 2019 18:13