Opel GT/AL 1.9 group 4 (1969)
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Specifications

103463 total units built
1968-1970, GT 1.1 lt: 3573 units
GT/J: 10760 units

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Group 4
1979cc, 95.0 x 69.8 mm
185 hp (138 kW)
200 hp (149 kW) with crossflow DVA heads
156 ft.lbs
Enem R12 camshaft (SOHC), 316degree 12.5mm lift, 45mm inlet valve diameter, 41mm exhaust valve diameter
aspiration, natural with 2 x Weber 48 DCO SP carburetors

Group/Class 3 Homologation number: 611 and replaced by 3012
Years active 1969-1970 Homologation start: 1/4/1969 and 1/4/1970
Homologation end: 1/4/1970 and 31/12/1977
Engine
Type Opel CIH 19S, straight 4 cyl, 4 stroke, petrol engine located front longitudinal
Capacity 1897 cc WRC: 1897 cc
Bore x Stroke (mm) 93.0 x 69.8
Compression ratio 9.5:1
Output power - torgue 90 HP / 66 kW @ 5100 rpm, 101 HP / 75 kW @ 5200 to 5400 rpm 14.9 kgm @ 2500-3100 rpm, 156.9 Nm (116 ft.lbs) @ 3100 rpm
Main bearings forged steel crankshaft with 5 main bearings 62mm diameter connecting rod length between centers 134mm, big end bearing internal diameter 52mm, aluminium alloy piston 45 mm compression height. 1970, group 4: modified connecting rod with piston compression height 35mm
Materials block: grey cast iron, 208mm deck height cylinderhead: reverse flow cast iron with "wedge" shape combustion chambers. 1970, group 4: cross flow aluminium alloy with "pent roof" shaped combustion chambers (not valid)
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.
1970, group 4: SOHC located above valves
2 valves/cyl. - 8 valves total. 40mm inlet valve diameter, 34mm (1970, group 4: 35mm) exhaust valve diameter. 25o angle between inlet/exhaust valves axis and vertical (inlet and exhaust valves are parallel)
Aspiration natural with 1 x Solex 32 TDID-2 with wet air filter. 1971, GT/J: dry paper air filter
Ignition Contact breakers with ignition distributor and dual vacuum ignition control, firing order 1-3-4-2. Click here for electrical system
Cooling system jacketed watercooled with pump, radiator, 340/360 mm diameter-5 blades fan and thermostat 6 lt
Lubrication system wet sump with 1 oil cooler 3.3 lt. 1971, GT/J: 3.8 lt
Transmission
Type rear wheel drive Opel Rekord, 4 speed manual gearbox. 1971, group 4: ZF S5-18/3, 5 speed manual gearbox
Gearbox ratios constant: 1.438/1 (23/16)
1st: 3.428/1 (31/13)
2nd: 2.156/1 (24/16)
3rd: 1.366/1 (19/20)
4th: 1.000/1
R: 3.317/1 (18/13 x 30/18)
constant: 1.167/1 (21/18)
1st: 2.87/1 (32/13)
2nd: 1.75/1 (24/16)
3rd: 1.29/1 (21/19)
4th: 1.000/1
R: 2.69/1 (18/13 x 30/18)
constant: 1.294/1 (22/17)
1st: 3.09/1 (31/13)
2nd: 1.75/1 (23/17)
3rd: 1.23/1 (19/20)
4th: 1.000/1
R: 2.99/1 (18/13 x 30/18)
1971, group 4: constant: 1.259/1 (34/27)
1st: 2.99/1 (38/16)
2nd: 1.76/1 (35/25)
3rd: 1.30/1 (31/30)
4th: 1.000/1
5th: 0.89/1 (27/34)
R: 3.64/1 (18/13 x 30/18)
Diffrential ratio 3.44/1 (31/9), 3.67/1 (33/9), 3.89/1 (35/9), 4.22/1 (38/9) hypoid spiral bevel gears limited slip rear differential
Clutch dry single disc, 204mm diameter. 1970, group 4: 230mm diameter
Chassis-body
Type steel monocoque chassis with roll-cage. 2 door coupe steel bodyshell, with steel doors and steel front bonnet. 1970, group 4: plastic doors, plastic front bonnet, and plastic extended wheel arches
Front suspension double unequal wishbones with upper "A" small wishbone, lower arm and 18mm stabilizer "pi" bar, lower transverse 3-leaf spring and telescopic shock absorbers
Rear suspension live axle with 2 longitudinal radius arms, Panhar rod, coil springs, telescopic shock absorbers and anti roll bar
Steering system rack and pinion (no servo) 3 turns lock to lock
Brakes front solid discs 238mm diameter with 2 cast iron piston calipers, rear drums 230mm diamter with 1 cast iron double piston caliper 15.87 mm diameter. 1970, group 4: front ventilated discs.
1972, group 4: rear solid or ventilated discs 268mm diameter with 2 aluminium piston calipers
dual circuit with Mastervac T51 vacuum servo
Dimensions
length: 4,113 mm (162") width: 1580 mm (62.2"),
1970, group 4: 1680 mm (66.1")
height: 1225 mm (48.2")
wheelbase: 2431 mm (95.7") front track: 1254 mm (49.4")
1278 mm (50.3") with 5.5J-13"
rear track: 1284 mm (50.6")
1308 mm (51.5") with 5.5J-13"
Rims - tires steel 5 x 13", steel or magnesium 5.5J-13" 6.45-13" or 165 HR 13"
Weight 895-940 kg
Fuel tank 50 lt. 1971, GT/J: 55 lt
Drag coefficient 0.41

Results in WSCC

Season
Group 4 classification is noted in brackets
Car entry, chassis number Car number/ result
Buenos Ayres Dayt Sebring Brands Hatch Monza Spa Targa Florio Nurb Le Man Zeltweg Watkins Glen
Team 1000km 24h 12h 1000km 1000km 1000km 1000km 24h 1000km 6h
Conrero Squadra Corse #52, dnf
Conrero Squadra Corse #54, dnf
Conrero Squadra Corse #60, 9th (4th)
Total points
2
2
Statistics
Works Starts/finishes 3/1 3/1
Driver Team entries and car number
Conrero Squadra Corse
Giuseppe Marotta 52
Gianpaolo Benedini 52
Pino Pica 54
Giorgio Pianta 54
Salvatore Calascibetta 60
Paolo Monti 60

Results in WRC

Works team: -

Season
Entry Rally event
Driver
Codriver
Team M.C SVE
Entry list
S.R KEN A GRE RAC
Entry list
Henri Greder
LarsClaude Perramond
Greder Racing acci dent
Hegmann
Kissel
dnf
Becker
Pieper
dnf
Norbert Orac
Christian Hübner
Auto-Revue dnf
Statistics
Others starts/finishes 4/0 3/0 1/0

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Drawings

1969%20Opel%20G%20Cutaway%20lg.jpg Source

Engine

Opel_CIH_Engine_3.jpg Source
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