Opel Manta A group 2 (1971)
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Specifications

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Group/Class 2 Homologation number: 1.6: 5390 and 1.9: 5391
Years active 1971-1976 Homologation start: 1/1/1971
Homologation end: 31/12/1980
Engine
Type Opel CIH 19S, straight 4cyl, 4 stroke, petrol engine. Click here located front longitudinal
Capacity 1897 cc WRC: 1897 cc
Bore x Stroke (mm) 93.0 x 69.8
Compression ratio 9.0:1, 1974: 9.6:1
Output power - torgue DID: 90 HP @ 5100 rpm
CCI: 93 HP @ 5600 rpm
1974: 105 HP @ 5500 rpm
160 - 205 HP / 7000 rpm
DID: 14.9 kgm @ 2500-3100 rpm
CCI: 15.5 kgm @ 4200 rpm
1974: 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 compression height
Materials block: grey cast iron, 208mm deck 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, 1973: Solex 40-42 CCI carburetor
Ignition electronic, firing order 1-3-4-2
Cooling system jacketed watercooled with pump, radiator, 320 mm diameter-5 blades (or 360 mm - 7 blades) fan and thermostat 5.8 - 6.2 lt
Lubrication system wet sump 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)
group 2: 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 4.222/1 (38/9), 3.67/1 (33/9), 3.89/1 (35/9) hypoid spiral bevel gear rear limited slip differential
Clutch dry single disk, 204mm diameter. Group 2: 215 or 230 mm 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. Rear drum brakes 230mm drum diameter with 1 double piston caliper 15.9 mm piston diameter dual circuit with vacuum servo
Dimensions
length: 4.292 m (169.0 in) width: 1.626 m (64.0"), group 2: +100 mm height: 1.355 m (53.3 in)
wheelbase: 2.430 m (95.7 in) front track: 1.331 m (52.4") rear track: 1.320 m (52.0")
Rims - tires 5J - 5.5J x 13", 1974: 6J x 13" 165-13", 185/70-13"
Weight 905 kg
Fuel tank 48 - 70 lt

Results in WRC

Season
Entry Rally event
Driver
Codriver
Team M.C SVE
Entry list
S.R KEN MAR A GRE RAC
Entry list
#92 (1897) dnf*
Apple (1584)
Schmidz
dnf*
Fara (1584)
Allegretti
dnf*
#130 (1584) dnf*
Curt Bengtsson
Bengt Bengtsson
?
Sören Hellqvist
Kent Hegbo
?
Jan Jordell
Krister Möller
?
Jean Ragnotti
Jean Rouget
?
Alex Jackson
Henry Barton
?
Statistics
Others starts/finishes 6/0 1/0 3/0 2/0

*Group 1 entries


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Drawings

opel_manta_a_gt-e_1970.jpg Source

Engine

Opel_CIH_Engine_3.jpg Source
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