Opel Ascona B 2.0 group 2 (1978)
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ascona-b-6668261277705562616.jpg Source Development chain
1971: Opel Ascona A SR
1978: Opel Ascona B 2.0
Development level
Group 4
Group 2

Specifications

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Group/Class 2/3 or A/7 Homologation number: 5612 (02/01F), A5053, A5067 and A5068
Years active 1978-1985 Homologation start: 1/8/1978, 1/7/1982 and 1/10/1982
Homologation end: group 2: 31/12/1981, group A: 31/12/1986
Engine
Type Opel CIH 20E, straight 4cyl, 4 stroke. Click here located front longitudinal
Capacity 1979 cc WRC: 1979 cc
Bore x Stroke (mm) 95.0 x 69.8
Compression ratio 11.5:1
Output power - torgue 160 - 185 HP / 7100 rpm 21.4 kgm (210 Nm) / 5500 rpm
Main bearings heat treated steel crankshaft with 5 main bearings 58mm diameter, 52mm big end journal diameter connecting rod length between centers 128mm, big end bearing tunnel diameter 55mm
Materials block: grey cast iron, 208mm deck height cylinderhead: reverse flow cast iron with "wedge" shape combustion chambers
Cams/valves single overhead camshaft (SOHC), chain driven 2 valves/cyl. - 8 valves total. 42mm inlet valve diameter, 37mm exhaust valve diameter. Operation with rocker arms and cam followers
Aspiration natural, 1 x GM Strasburg Varajet II twin carburetor, or 1 x Zenith 35/40 INAT twin carburetor,
i2000: 2 x Solex 45 ADDHE twin carburetors,
20E: Bosch L-jetronic electronic multipoint fuel injection
Ignition electronic, firing order 1-3-4-2
Cooling system jacketed watercooled with pump, radiator, fan and thermostat 7 lt
Lubrication system dry sump
Transmission
Type rear wheel drive 4 speed or ZF S5-18/3 5 speed gearbox
Gearbox ratios constant input: 1.167/1 (21/18)
1st: 2.871/1 (32/13)
2nd: 1.751/1 (24/16)
3rd: 1.289/1 (21/19)
4th: 1.000/1
R: 2.692/1 (18/13 x 30/18)
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: 0.968/1 (30/31)
1st: 2.299/1 (38/16)
2nd: 1.798/1 (39/21)
3rd: 1.355/1 (35/25)
4th: 1.141/1 (33/28)
5th: 1.000/1
R: 2.816 (18/11 x 32/18)
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 (25/36)
R: 3.670 (18/11 x 32/18)
1980+: constant input: 1.526/1 (29/19)
1st: 3.639/1 (31/13)
2nd: 2.119/1 (25/18)
3rd: 1.335/1 (21/24)
4th: 1.000/1
R: 3.522/1 (30/18 x 18/13)
Diffrential ratio 3.444/1 (31/9), 4.750/1 (38/8), 5.280/1 (37/7), 3.667/1 (33/9), 3.889/1 (35/9), 4.222/1 (38/9), 3.180/1 (35/11) hypoid spiral bevel gear limited slip rear differential
Clutch dry single disk, 216mm diameter
Chassis-body
Type steel monocoque chassis with front suspension reverse "pi"-shaped subframe bridge and roll-cage. 2 door coupe steel bodyshell with steel front and rear bumbers. 1980+: plastic front and rear bumbers
Front suspension double unequal 'A' wishbones with coil springs, telescopic gas shock absorbers and anti roll bar
Rear suspension live axle with 2 longitudinal trailing radius arms, transverse linkage bar, coil springs and telescopic gas shock absorbers
Steering system rack and pinion (no servo) 17.5/1 ορ 15.5/1 ratio
Brakes front solid or ventilated discs 246mm diameter with 2 steel piston calipers 48mm diameter, or ventilated discs 246mm diameter with 2 steel piston calipers 42mm diameter, or ventilated discs 256mm diameter with 4 aluminium piston calipers 37.5mm diameter. Rear drum brakes with 230mm drum diameter with 1 double piston caliper 16/19.05/22mm diameter, or solid disks 253mm diameter with 2 aluminium piston calipers 44.5mm diameter. 1984: rear solid discs 254mm diameter with 2 cast iron piston calipers 33mm diameter dual circuit with vacuum servo, and adjustable ration split front to rear
Dimensions
length: 4.321 m (170.1 in) width: 1.640 m (64.6 in) height: 1.380 m (54.3 in)
wheelbase: 2.518 m (99.1 in) front track: 1.375 m (54.1 in) rear track: 1.375 m (54.1 in)
Rims - tires 6J x 13", **1981+: 6J x 15"
Weight 1000 kg
Fuel tank 50, 60, 80 or 100 lt

Results in WRC

Races

Works team: Opel Eurohandler Team

Season
Entry Rally event
Driver
Codriver
Team MC SVE
Entry list
KEN POR GRE FIN CAN S.R CdI TdC RAC
Shekhar Mehta
Mike Doughty
works cam shaft
Statistics
Others starts/finishes 1/0 1/0

Information and articles

Article from 4T 180, 9/1985

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Drawings

opel_ascona_b-27753.jpg Source
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