Lancia Stratos HF group 4 (1974)
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Home » Rally Cars » Lancia Stratos HF
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1974: Lancia Stratos HF
1976: Lancia Stratos HF 24V

Chassis numbers

Specifications

492 units built
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Group 5
560 hp / 420 kW
aspiration, 1 x KKK turbocharger

Group/Class 4/4 Homologation number: 640
Years active 1974 - 1975 Homologation start: 1/10/1974
Homologation end: 31/12/1981
Engine
Type Ferrari tipo 236E 829.A, V6 (65o) cyl, 4 stroke, petrol engine located center transverse
Capacity 2418 cc, 2444 cc WRC: 2418 cc, 2444 cc
Bore x Stroke (mm) 92.5 x 60.0, 93.0 x 60.0
Compression ratio 9.8:1, 14.0:1
Output power - torgue 190 HP @ 7000 rpm
240 - 265 HP @ 7800 rpm
23 kgm @ 4000 rpm
28 Kgm @ 4500rpm
Main bearings forged steel crankshaft with 4 main bearings 63mm diameter, and 43.6 mm big end journal diameter steel connecting rod length between centers 118mm, 47mm big end bearing tunnel diameter, aluminium alloy pistons with 35mm compression height, (1 compression ring and 1 oil ring) 2 piston rings
Materials block: cast iron cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers
Cams/valves 2 x 2 overhead camshafts (DOHC), double-chain driven 2 valves per cyl - 12 valves total. 42.5 mm (45mm) inlet valve diameter, 36.8 mm (39mm) exhaust valve diameter. 46o angle between inlet and exhaust valves axes. 2 coil springs per valve
Aspiration natural, 3 x Weber 40 IDF29, or 3 x Weber 48 IDF carburetors
Ignition Marelli distributor with electronic Dinoplex, firing order: 1-4-2-5-3-6, 12V battery, NGK BP8 EVX spark plugs
Cooling system jacketed watercooled with pump, radiator, 280 mm diameter-5 blades fan and thermostat 15 lt
Lubrication system wet sump 7 lt
Transmission
Type rear wheel drive Lancia 5 speed manual gearbox
Gearbox ratios constant: 33/30 (1.100/1)
1st: 3.554/1 (42/13)
2nd: 2.459/1 (38/17)
3rd: 1.781/1 (34/21)
4th: 1.320/1 (30/25)
5th: 0.982/1 (25/28)
R: 3.300/1
Rally: 1st: 3.143/1 (44/14)
2nd: 2.24/1 (38/17)
3rd: 1.762/1 (37/21)
4th: 1.417/1 (34/24)
5th: 1.154/1 (30/26)
R: 3.30/1
Pista: 1st: 2.8/1 (48/15)
2nd: 2.053/1 (39/19)
3rd: 1.62/1 (34/21)
4th: 1.32/1 (33/25)
5th: 1.154/1 (30/26)
R: 3.30/1
Diffrential ratio 3.824/1 (65/17), 3.42/1 (65/19) helical gears limited slip rear differential
Clutch dry single disc, 228mm diameter
Chassis-body
Type steel monocoque 829 AR chassis with front suspension subframe and rear suspension bridge. 2 door coupe steel bodyshell. Optional extended plastic wheel arches and front/rear spoilers
Front suspension double wishbones with upper A wishbone, one lower transferse arm and a lower angled radius arm, coil spring, telescopic shock absorber and anti-roll bar
Rear suspension mc pherson strut with one lower transferse arm and a lower angled radius arm, coil spring, telescopic shock absorber and anti-roll bar
Steering system rack and pinion (no servo) 3.3 turns lock to lock
Brakes front ventilated discs 271mm diameter and 2 piston calipers 48mm diameter. Rear ventilated discs 271mm diameter and 2 piston calipers 38 mm diameter.
1977: front ventilated discs 267mm diameter and 4 piston calipers 44.5mm diameter. Rear ventilated discs 267mm diameter and 4 piston calipers 38.1 mm diameter
dual circuit (no servo)
Dimensions
length: 3.710 m (146.1") width: 1.760 m (69.3") +100 mm height: 1.110 m (43.7")
wheelbase: 2.180 m (85.5") front track: 1.430 m (56.3") rear track: 1.460 m (57.5")
Rims - tires 7.5J x 14", tarmac: front 8Jx15", rear 10Jx15" tarmac: Pirelli P7, front 225/50x 15", rear 345/35x15"
Weight 880 kg
Fuel tank 80 lt

Results in WSCC

Season
Group 5
Car entry, chassis number Car number/ result
Dayt Vallel Dijon Monza Spa Targa Florio Nurb Le Man Zeltweg Watkins Glen
Team 24h 6h 1000km 1000km 1000km 1000km 24h 1000km 6h
Lancia Corse, 0002 #4, 2nd
Total points
9
9
Statistics
Works Starts/finishes 1/1 1/1
Driver Team entries and car number
Lancia Corse
Sandro Munari 4
Jean-Claude Andruet 4

Results in WRC

Races

Works team: Lancia Alitalia

Season
Entry Rally event
Driver
Codriver
Team POR KEN FIN S.R R.L P.R RAC TdC
Sandro Munari
Mario Mannucci/ Piero Sodano
1524
Lancia Marlboro 1st 1st distri butor engine
Sandro Munari
Piero Sodano
1512
Lancia Marlboro 3rd
Amilcare Ballestrieri
Silvio Maiga/ Mauro Mannini
1513
Lancia Marlboro acci dent elec trical
Jean-Claude Andruet
'Biche'
1626
Lancia Marlboro 1st
Roberto Cambiaghi
Gianpiero Bertocci
dnf
Gabriele Sciascia
Francesco Bullani
Jolly Club dnf
Total points
()
38 10 10 8 10
Statistics
Others starts/finishes 10/4 4/1 1/1 1/0 1/1 3/1

Article from 4T 269, 2/1993

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Article from 4T 91, 4/1978

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Lancia_Stratos-scuderie-3.jpg Source
lancia-stratos-muddy-engine.jpg Source
Björn Waldegård-Hans Thorszleius in RAC rally '75
v6dino.jpg Source

Drawings

Lancia_Stratos_cutaway_by_Shin_Yoshikawa.77204234_std.jpg
10028121t2.jpg Source
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