Alfa Romeo Alfetta GTV6 group 2 (1980)
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Specifications
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| Group/Class | 2 and A/8 | Homologation number: 674, 5855, A5135 and transferred by FIA to B288 (insufficient internal dimensions for group A) | |
| Years active | 1982-1985 | Homologation start: 1/1/1981, 1/10/1981, 1/4/1983 and 1/1/1987 Homologation end: 1/10/1981, 31/12/1981, 1/1/1987 and 31/12/1991 |
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| Engine | |||
|---|---|---|---|
| Type | Alfa Romeo Busso V6, code AR 016.46, V6 cyl (60o), 4 stroke, petrol engine | located front longitudinal | |
| Capacity | 2492.5 cc | WRC: 2492.5 cc | |
| Bore x Stroke (mm) | 88.0 x 68.3 | ||
| Compression ratio | 10.2:1, 11.0:1 | ||
| Output power - torgue | 215 - 220 HP / 7000 rpm | 25.0 kgm (245 Nm) / 4600 rpm | |
| Main bearings | forged steel crankshaft with 4 main bearings 60mm diameter | connecting rod length between centers 131mm, big end bearing tunnel diameter 52mm, aluminium alloy piston 34.35mm compression height | |
| Materials | block: aluminium alloy with cast iron cylinder liners, 200 mm deck height | cylinderhead: 2 x cross flow aluminium alloy with hemispherical combustion chambers | |
| Cams/valves | 2 x 1 overhead camshafts (SOHC), chain driven. Direct operation for inlet valves, exhaust valves operate with pushrods and rocker arms | 2 valves/cyl. - 12 valves total. 42mm inlet valve diameter, 37mm exhaust valve diameter. 47o angle between inlet valve axis and exhaust valve axis. 2 coil springs per inlet and exhaust valve | |
| Aspiration | natural, Bosch L-jetronic 0580.464.020 multipoint electronic fuel injection | ||
| Ignition | electronic, firing order 1-4-2-5-3-6 | ||
| Cooling system | jacketed watercooled with pump, radiator, 280mm diameter-4 blades fan and thermostat | 13.5 lt | |
| Lubrication system | wet sump | 7 lt | |
| Transmission | |||
| Type | rear wheel drive | 5 speed manual gearbox located in front of the rear axle, on same case with differential | |
| Gearbox ratios | 1st: 3.500/1 (49/14) 2nd: 1.956/1 (45/23) 3rd: 1.345/1 (39/29) 4th: 1.026/1 (39/38) 5th: 0.780/1 (32/41) R: 2.620/1 (34/13) |
1st: 2.570/1 (36/14) 2nd: 1.940/1 (33/17) 3rd: 1.550/1 (31/20) 4th: 1.220/1 (28/23) 5th: 1.000/1 (25/25) R: 2.620/1 (34/13) |
group 2: 1st: 2.33/1 (35/15) 2nd: 1.55/1 (31/20) 3rd: 1.22/1 (28/23) 4th: 1.22/1 (25/25) 5th: 0.89/1 (24/27) R: 2.62/1 (34/13) |
| Diffrential ratio | 4.100/1 (41/10), 5.129/1 (41/8), 4.555/1 (41/9), 3.910/1 (47/12) Group 2: 3.41/1 (41/12), 3.59/1 (43/12), 3.75/1 (45/12), 3.91/1 (43/11), 4.3/1 (43/10), 4.56/1 (41/9), 5.12/1 (41/8), 5.86/1 (41/7), 4.77/1 (43/9), 5.37/1 (43/8), 6.14/1 (43/7). 1983, group A: 3.54/1 (39/11), 3.81/1 (42/11), 4.56/1 (41/9), 4.3/1 (43/10), 4.77/1 (43/9), 5.37/1 (43/8) |
ZF limited slip with friction disks, hypoid bevel gear rear differential | |
| Clutch | dry single plate 190mm diameter | ||
| Chassis-body | |||
| Type | steel monocoque chassis with 5.4kg AlZn4.5Mg1 aluminium alloy (D40x1.5mm) roll-cage. 2 door coupe steel bodyshell, with steel doors, steel front/rear bonnets and polyurethane front/rear bumbers | ||
| Front suspension | double wishbones with lower 'A' wishbone and 2 upper 'L' links , lower longitudinal torsion bars, telescopic shock absorber and anti-roll bar | ||
| Rear suspension | trailing semi-trailing arm with de dion tube 'dead' axle, watt's linkage, coil spring and telescopic shock absorber | ||
| Steering system | rack and pinion (no servo) | 3.25 turns lock to lock, 19.5/1 or 15.9/1 ratio | |
| Brakes | front ventilated disks 260mm diameter with 2 cast iron piston calipers 48mm diameter, rear solid disks 250mm diameter with 2 cast iron piston calipers 38mm diameter. Group 2: front and rear ventilated discs 257mm diameter with 4 aluminium piston calipers 38mm diameter. 1983, group A: front ventilated discs 257mm diameter with 4 aluminium piston calipers (Lockheed CP2561-2) 41.3mm diameter, or ventilated discs 279mm diameter with 2 x 2 aluminium piston calipers 38mm diameter, rear ventilated discs 254mm diameter with 2 x 2 aluminium piston calipers 38mm diameter Rear discs are inboard located, in gearbox/differential case |
dual circuit with vacuum servo, adjustable ratio split front to rear | |
| Dimensions | |||
| length: 4.263 m (167.8") | width: 1.664 m (65.5") | height: 1.330 m (52.4") | |
| wheelbase: 2.400 m (94.5") | front track: 1.375 m (54.1") | rear track: 1.355 m (53.3") | |
| Rims - tires | 6" x 15" | TRX 15/45-390 | |
| Weight | 1140 kg | 50% - 50% front to rear distribution | |
| Fuel tank | 50 or 73 lt, group 2: 100 lt | ||
| Drag coefficient | 0.39 | ||
Results in WRC
Races
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Drawings
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Engine
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Gearbox
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Suspension
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page revision: 208, last edited: 22 Dec 2019 23:40