Vauxhall HC Viva Magnum 2300 group 2 (1972)
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Specifications

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Group 1 2 1
Homologation number 5476 1649 5564 5565
Homologation start 1/7/1972 1/2/1973 1/4/1974 1/4/1974
Homologation end 31/12/1981 31/12/1977 31/12/1981 31/12/1981
Model HC Viva Firenza 2300 HC Viva 2300 HC Viva 2300 Firenza Magnum 2300
Years active 1972-1976
Engine
Type Vauxhall Slant-4 153607, straight 4 cyl, 4 stroke, petrol engine located front longitudinally with 45o inclination to the drivers side (LHD)
Capacity 2279 cc WRC: 2279 cc
Bore x Stroke (mm) 97.59 x 76.2 mm
Compression ratio 8.5:1. 1974 Magnum: 9.2:1
Output power - torgue 122 or 128 HP @ 5500 rpm
170-190 HP		 150 lbf @ 3200 rpm
Main bearings 5 of 63.5mm diameter big end bearing diameter 50.8mm, aluminium alloy piston 39 mm compression height
Materials block: chromium cast iron cylinderhead: Lotus 904 cross flow chromium cast iron with hemishperical combustion chamber and vertical valves. 1974 Magnum: Lotus 907 16V cross flow aluminium alloy with hemishperical combustion chambers
Cams/valves single overhead camshaft (SOHC), belt driven. 1974 Magnum: DOHC 2 valves/cyl. - 8 valves total. 43mm inlet valves diameter, 36mm exhaust valves diameter. 2 coil springs per valve. 1974 Magnum: 47mm inlet valve diameter, 40.5mm exhaust valve diameter
1974 Magnum: 4 valves/cyl - 16 valves total
Aspiration natural, 2 x Zenith 175 CD carburetors. 1974 Magnum: 2 x Dell'Orto 48 DHLA carburetors
Ignition with contact breakers, firing order 1-3-4-2 12V battery
Cooling system jacketed watercooled with pump, radiator, 320 mm diameter-8 blades (or 349mm-4 blades) fan and thermostat. 1974: 360mm diameter-5 blades 5 or 8 lt
Lubrication system wet sump. 1974 Magnum, group 2: dry sump 4.8 lt
Transmission
Type rear wheel drive Getrag, 4 speed manual gearbox. 1974 Magnum: 271-5, 272-5, 5 speed manual gearbox
Gearbox ratios constant: 1.30/1 (?/?)
1st: 3.30/1 (33/13)
2nd: 2.145/1 (33/20)
3rd: 1.414/1 (25/13)
4th: 1.000/1
R: 3.064/1 (33/14)		 constant: 1.176/1 (?/?)
1st: 2.521/1 (30/14)
2nd: 1.765/1 (27/18)
3rd: 1.353/1 (23/20)
4th: 1.000/1
R: 2.772/1 (33/14)		 constant: 1.30/1 (?/?)
1st: 3.30/1 (33/13)
2nd: 2.141/1 (28/17)
3rd: 1.362/1 (22/21)
4th: 1.000/1
R: 3.064/1 (33/14)		 1974 Magnum: 1st: 2.99/1 (34/27)
2nd: 1.76/1 (36/25)
3rd: 1.30/1 (31/30)
4th: 1.00/1
5th: 0.87/1 (16/38)
R: 3.67/1 (32/11/19)		 1977 Magnum: 1st: 2.30/1 (38/16)
2nd: 1.80/1 (39/21)
3rd: 1.36/1 (35/25)
4th: 1.14/1 (30/28)
5th: 1.00/1
R: 2.82/1 (32/11/19)
Diffrential ratio 3.455 (38/11), 4.100/1 (41/10), 3.727/1 (41/11). Group 2: 3.90/1 (39/10), 4.6/1 (37/8) heavy duty 4HA rear axle with hypoid spiral bevel gears rear differential
Clutch dry single plate 216mm diameter. Group 2: double plate 184 mm diameter. 1974 Magnum: single plate 240 mm diameter
1974 Magnum, group 2: triple plate 197 mm diameter
Chassis-body
Type steel monocoque chassis with front suspension subframe. 2 door coupe steel bodyshell. Group 2: extended wheel arches and rear spoiler
Front suspension double unequal wishbones with A arms, coil springs, telescopic shock absorbers and anti roll bar
Rear suspension live axle with 2 lower longitudinal radius links, 2 upper short radius links at 45o, coil springs, telescopic shock absorbers
Steering system rack and pinion (no servo) 3.1 turns lock to lock. 1977 Magnum: 2.75 turns
Brakes Front solid disc brakes 255 mm disc diameter with 1 piston caliper 48.2 mm diameter, 1974: 2 piston calipers 50.8mm diameter. Rear drums 229 mm diameter with 1 double piston caliper 19.1 mm diameter. Group 2: front ventilated discs.
1974 Magnum, group 2: rear solid or ventilated discs 257 mm diameter with 2 piston calipers 44.5mm diameter		 dual circuit without vacuum servo
Dimensions
length: 4.135 m (162.8") width: 1.643 m (64.7"), group 2: +100 mm height: 1.326 m (52.2")
wheelbase: 2.461 m (97.0") front track: 1.314 m (51.75") rear track: 1.314 m (51.75")
Rims - tires 5J or 5.5J x 13". Group 2: 7/8/9/10/11/12 X 13"
Weight 920-1020 kg
Fuel tank 55 lt

Results in WRC

Races

Works team: Dealer Team Vauxhall

Season

Vauxhall Firenza
Entry Rally event
Driver
Codriver		 Team M.C SVE KEN MAR GRE A S.R USA RAC
Entry list
Chris Coburn
Rodney Spokes		 works 33rd*
Barry Williams
Don Barrow		 works dnf
David Thompson
Maurice Isley		 35th
Pip Dale
Richard Stark		 45th*
Peter Thompson
Ken Forster		 49th
Will Sparrow
Nigel Raeburn		 The Martin Group shock absorber
Ron Shipp
Dave Whiteley		 dnf
Arthur Jasper
Stewart Parker		 dnf
Statistics
Others starts/finishes 8/4 8/4

*Group 1 entries

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Will Sparrow in RAC '72
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Will Sparrow in RAC '75
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Will Sparrow in RAC '75
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Firenza 2300 Sports SL Coupe '72
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Viva Magnum
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Front subframe
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Front suspension
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Rear suspension

Drawings

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vauxhall-firenza-hpf-1974.png Source
page revision: 143, last edited: 26 Jan 2019 15:35
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