Lancia Delta S4 group B (1985)
 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
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 |
|
| Engine | |||
|---|---|---|---|
| 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 |
|
| 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
Source
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Drawings
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CAD
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page revision: 101, last edited: 02 Jan 2023 16:30