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

Engine
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
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. 25^o 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