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 '75
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Will Sparrow in RAC '75
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Firenza 2300 Sports SL Coupe '72
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Front subframe
Moggysus.jpg~original Source
Front suspension
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Rear suspension

Drawings

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page revision: 165, last edited: 04 Aug 2025 10:07
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