Alfa Romeo Alfetta Turbodelta group B (1980)
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Specifications
400 units built
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| Group/Class | 4/4 | Homologation number: 668 | |
| Years active | 1980-1981 | Homologation start: 1/2/1980 Homologation end: 31/12/1981 |
|
| Engine | |||
|---|---|---|---|
| Type | Alfa Romeo Twin Cam, straight 4 cyl, 4 stroke, petrol engine | located front longitudinally | |
| Capacity | 1962 cc | WRC: x 1.4 = 2747 cc | |
| Bore x Stroke (mm) | 84.0 x 88.5 | ||
| Compression ratio | 7.0:1 | ||
| Output power - torgue | 175 HP @ 5500 rpm 280 HP @ 7000 rpm |
230 lbf @ 3500 rpm 42 kgm @ 4000 rpm |
|
| Main bearings | forged steel crankshaft with 5 main bearings 60mm diameter, big end journal diameter 50mm | connecting rod length between centers 157mm, big end journal diameter 53.7mm, aluminium alloy piston 22mm pin diameter | |
| Materials | block: aluminium alloy with cast iron wet cylinder liners. 235mm deck height | cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers | |
| Cams/valves | 2 overhead camshafts (DOHC), double chain driven | 2 valves/cyl. - 8 valves total. 80o angle between inlet valve axis and exhaust valve axis | |
| Aspiration | 1 x K26-2470R4:11 turbocharger (aluminium alloy compressor 42.7/61mm diameter), 2 x Weber 40 DCOE, or Dellorto DHLA40H Carburetors | pressure: 0.9 bar (street) 1.8 bar (racing) |
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| Ignition | Marelli electronic, firing order 1-3-4-2 | ||
| Cooling system | jacketed watercooled with pump, radiator, fan and thermostat | ||
| Lubrication system | wet sump or dry sump with 1 oil cooler | 11 lt | |
| Transmission | |||
| Type | rear wheel drive | 5 speed manual gearbox, located in front of rear axle, on same case with differential | |
| Gearbox ratios | 1st: 3.307/1 (43/13) 2nd: 1.956/1 (45/23) 3rd: 1.345/1 (39/29) 4th: 1.026/1 (39/38) 5th: 0.833/1 (35/42) R: 2.62/1 (34/13) |
1st: 2.57/1 (36/14) 2nd: 1.94/1 (33/17) 3rd: 1.55/1 (31/20) 4th: 1.22/1 (28/23) 5th: 1.00/1 (25/25) R: 2.62/1 (34/13) |
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| Diffrential ratio | 4.10/1 (41/10), 4.56/1 (41/9), 5.12/1 (41/8) | ZF hypoid spiral bevel gears 25% limited slip rear differential | |
| Clutch | dry double plate | ||
| Chassis-body | |||
| Type | steel monocoque chassis with front suspension cross-member sub-frame, roll-cage. 3 door steel coupe bodyshell | ||
| 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) | 3.5 turns lock to lock | |
| Brakes | front solid discs 255mm diameter with 2 piston calipers 48mm diameter, rear solid discs 255mm diameter with 2 piston calipers 38mm diameter. Ventilated discs all around 257mm diameter with 4 piston calipers 38/41mm diameter AP CP2270/71. Rear discs are inboard located, in gearbox/differential case |
dual circuit with vacuum servo, adjustable ratio split front to rear | |
| Dimensions | |||
| length: 4345 mm (171.1") 4140 mm (163") no bumpers |
width: 1664 mm (65.5") | height: 1334 mm (52.5") | |
| wheelbase: 2400 mm (94.5") | front track: 1.360 m (53.5") | rear track: 1.358 m (53.5") | |
| Rims - tires | 6 x 14". front 8x13", rear 10x13". Tarmac: Campagnolo magnesium, front 10x15", rear 12x15" | 185/70-14", front Pirelli 245/45x13", rear 265/40x13". Tarmac: front 235/60x15", rear 295/61x15" | |
| Weight | 980 kg | ||
| Fuel tank | 50 lt | ||
| Drag coefficient | 0.39 | ||
Source
Results in WRC
Statistics
| 1980 | Total | ||||||
| Total WRC results | |||||||
|---|---|---|---|---|---|---|---|
| Races/wins | 1 | 1 | |||||
| Entries/finishes | 2/0 | 2/0 | |||||
Races
Works team: -
SourceMauro Pregliasco in San Remo '80
Drawings
Source
Suspension
Source
SourceFront suspension
SourceRear suspension
page revision: 40, last edited: 13 Dec 2019 05:01