Opel Ascona A SR group 2 (1971)
 Source |
Development chain 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 (SOHC) located between valves (not above), also called cam in head (CIH), chain driven. Operation with rocker arms and cam followers | 2 valves/cyl. - 8 valves total. 40mm inlet valve diameter, 34mm (group 2: 35mm) exhaust valve diameter. 25o angle between inlet/exhaust valves axis and vertical (inlet and exhaust valves are parallel) | |
| 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 | ||||||||||||||
Source
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Source
Drawings
Engine
Source
page revision: 253, last edited: 14 Nov 2019 19:01