Opel Ascona A SR group 2 (1971)
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1971: Opel Ascona A SR
1978: Opel Ascona B 2.0

On board: see video

Specifications

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Group/Class 2 Homologation number: 5398, 1.6: 5399
Years active 1972-1977 Homologation start: 1/4/1971
Homologation end: 31/12/1980
Engine
Type Opel CIH 19S, straight 4cyl, 4 stroke, petrol engine located front longitudinal
Capacity 1897 cc up to 1960 cc WRC: 1897 cc
Bore x Stroke (mm) 93.0 to 94.5 x 69.8
Compression ratio 9.0:1 to 10.5:1
Output power - torgue DID: 90 HP @ 5100 rpm
CCI: 93 HP @ 5600 rpm
160 - 205 HP / 7000 rpm
DID: 14.9 kgm @ 2500-3100 rpm
CCI: 14.6 kgm @ 4000 rpm
20.9 kgm (205 Nm) / 6000 rpm
Main bearings forged steel crankshaft with 5 main bearings 62mm diameter forged steel connecting rod length between centers 128mm, big end bearing internal diameter 52mm, aluminium alloy piston with 45 mm (group 2: 35mm) piston compression height
Materials block: grey cast iron, 208mm dech height cylinderhead: reverse flow cast iron "wedge" shape combustion chambers
Cams/valves single overhead camshaft in head (SOHC-CIH), chain driven 2 valves/cyl. - 8 valves total. 40mm inlet valve diameter, 34mm (group 2: 35 mm) exhaust valve diameter. Operation with rocker arms and cam followers. 25o angle between exhaust/inlet valves and vertical
Aspiration natural, 1 x Solex 32 DIDTA-4 or 1 x Solex 40 CCI carburetor, or 2 x dual Weber 45 DCOE carburetors
Ignition electronic, firing order 1-3-4-2
Cooling system jacketed watercooled with pump, radiator, 320 mm diameter-5 (360 mm - 7 blades) blades fan and thermostat 5.8 - 6.2 lt
Lubrication system wet sump, group 2: dry sump 5.3 lt
Transmission
Type rear wheel drive 4 speed or ZF S5-18/3 5 speed gearbox
Gearbox ratios constant input: 1.438/1 (23/16)
1st: 3.427/1 (31/13)
2nd: 2.157/1 (24/16)
3rd: 1.366/1 (19/20)
4th: 1.000/1
R: 3.318/1 (18/13 x 30/18)
constant input: 1.167/1 (21/18)
1st: 2.871/1 (32/13)
3rd: 1.750/1 (24/16)
3rd: 1.289/1 (21/19)
4th: 1.000/1
R: 2.692 (18/13 x 30/18)
constant input: 1.259/1 (34/27)
1st: 2.990/1 (38/16)
2nd: 1.758/1 (35/25)
3rd: 1.304/1 (31/30)
4th: 1.000/1
5th: 0.874/1 (27/34)
R: 3.670 (18/11 x 32/18)
Diffrential ratio 3.444/1 (31/9), 4.222/1 (38/9), 3.67/1 (33/9), 3.89/1 (35/9), 4.75/1 (38/8) hypoid spiral bevel gear limited slip rear differential
Clutch dry single disk, 204mm diameter. Group 2: 216 or 230 plate diameter
Chassis-body
Type steel monocoque chassis with roll-cage. 2 door coupe steel bodyshell with steel front and rear bumbers. Group 2: extended wheel arches
Front suspension double wishbones with coil springs, telescopic gas shock absorbers and anti roll bar
Rear suspension live rigid axle with trailing radius arms, transverse linkage bar, coil springs and telescopic gas shock absorbers
Steering system rack and pinion (no servo) 3.5 turns lock to lock
Brakes front solid discs (group 2: ventilated) 238mm (1974: 244mm) diameter with 2 piston calipers 48 mm piston diameter, 1972: ventilated disc 268mm diameter with aluminium 2 piston calipers 48mm diameter. Rear drum brakes 230mm drum diameter with 1 double piston caliper 15.9 mm piston diameter dual circuit with servo
Dimensions
length: 4.124 m (170.1") width: 1.626 m (64.0"), group 2: +100 mm height: 1.385 m (54.5")
wheelbase: 2.430 m (95.7") front track: 1.331 - 1.349 m (52.4 - 53.1") rear track: 1.320 - 1.338 m (52.0 - 52.7")
Rims - tires 5J or 5.5J x 13", 7J or 8J x 13" 165-13", 185/70-13", 225/50-13" slick tires for tarmac
Weight 885-950 kg
Fuel tank 48 - 70 lt

Results in WRC

Races

Works team:

  • works: Opel Rally Team (1971-1972)
  • works1: Opel Mobil Team (1973)
  • works2: Opel Euro Handler Team (1974+)
Season
Entry Rally event
Driver
Codriver
Team M.C SVE
Entry list
S.R KEN MAR A GRE RAC
Entry list
Marie-Claude 'Beaumont'
Martine de la Grandrive
Greder Racing 31st
Henri Greder
Peter Jopp
Greder Racing ?
Hartmut Meyer (1600)
Wulf Besbinger
?
Statistics
Others starts/finishes 2/1 2/1

Opel_Ascona_A_Rallye.jpg Source
1971-ascona-a-group-2-012.jpg Source
IMG_0019.jpg Source

Drawings

Engine

Opel_CIH_Engine_3.jpg Source
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