Austin MG Metro Turbo group A (1983)
 |
Development level Group B Group A |
Specifications
Production| Group/Class | A/7 (1983-1987), A/8 (1988+) |
Homologation number: A5107 |
| Years active | Homologation start: 1/2/1983 Homologation end: 31/12/1992 |
|
| Engine | ||
|---|---|---|
| Type | A+ series, code 12HD26, straight 4 cyl, 4 stroke, petrol engine | located front transverse vertical |
| Capacity | 1275 cc | WRC: x1.4 = 1785 cc 1988: x 1.7 = 2168 cc |
| Bore x Stroke (mm) | 70.62 x 81.30 | |
| Compression ratio | 9.4:1 | |
| Output power - torgue | 170 - 190 HP / 7200 rpm | |
| Main bearings | forged steel crankshaft with 3 main bearings 44.45mm journal diameter | connecting rod length between centers 146.05mm. Big end bearing: tunnel diameter 48.15mm x 26.9mm width. Gudgeon pin 20.6mm diameter |
| Materials | block: cast iron with or without dry steel cylinder liners, 226mm deck height | 12G940 cylinderhead: reverse flow cast iron with "Weslake" design hemispherical shape combustion chambers and vertical valves |
| Cams/valves | side camshaft with overhead valves (OHV), single row chain driven | 2 valves/cyl. - 8 valves total. 35.9mm inlet valve diameter, 30.6mm exhaust valve diameter. 0o angle between inlet/exhaust valve axis and vertical. 2 homocentric coil spring per inlet and exhaust valve |
| Aspiration | 1 x Garret T3 turbocharger (11 blades nickel alloy turbine 48.7/58.9mm in/out diameter, 12 blades aluminium alloy compressor 40.3/60mm in/out diameter) with air/air intercooler, SU HIF44 carburetor | pressure: 1.1 bar |
| Ignition | electronic, firing order 1-3-4-2 | |
| Cooling system | jacketed watercooled with pump, radiator, fan and thermostat | 4.9 lt |
| Lubrication system | compartment sump | 4.8 lt |
| Transmission | ||
| Type | front wheel drive | 4 speed manual gearbox, located under the engine |
| Gearbox ratios | constant: 1.76/1 (30/17) 1st: 3.647/1 (31/15) 2nd: 2.185/1 (26/21) 3rd: 1.425/1 (21/26) 4th: 1.000/1 R: 3.667/1 (33/18 x 17/15) |
constant: 1.045/1 (23/22) 1st: 2.313/1 (31/14) 2nd: 1.567/1 (27/18) 3rd: 1.187/1 (25/22) or 1984: 1.194/1 (24/21) 4th: 1.000/1 R: 2.184/1 (31/18 x 17/14) |
| Diffrential ratio | 3.20/1 (61/19), 3.47/1 (52/15), 3.67/1 (55/15) 1/1 ratio for transfer box |
helical gears limited slip 80% front differential |
| Clutch | dry single disc, 181mm diameter | |
| Chassis-body | ||
| Type | steel monocoque. 10 or 11 kg aluminium HT30TS (D38x3 and D38x2mm), or 22.6 or 25kg steel BS980CDS (D38x3 and D38x2.6mm) roll-cage. 3 door steel hatchback bodyshell, with steel doors, steel front/rear bonnets and steel/plastic front rear bumpers. 1992: all aluminium roll cages cancelled |
|
| Front suspension | bottom transverse link braced by anti roll bar, top transverse link operating Hydragas spring or coil spring and telescopic gas shock absorbers | |
| Rear suspension | trailing arm with Hydragas spring or coil spring, telescopic gas shock absorbers and adjustable anti roll bar | |
| Steering system | rack and pinion (no servo) | 19.9/1 ratio, 2.25 turns lock to lock |
| Brakes | Front: ventilated discs 213mm diameter with 4 piston calipers 36mm diameter, rear drums 178mm diameter with 1 double piston caliper 17.5mm diameter. Front ventilated discs 254mm diameter with 4 cast iron piston calipers 38mm diameter, or 280/304mm diameter with 4 piston calipers 40mm diameter Rear solid discs 213mm diameter, or ventilated discs 203/254mm diameter with 4 aluminium piston calipers 38.1mm diameter, or solid discs 254mm diameter with 1 aluminium piston caliper 40.5mm diameter. Front/rear ventilated discs 254/280/304mm diameter, 2 aluminium piston calipers 36/38/40mm diameter. 1984: front ventilated discs 254/267/280/292/305mm diameter, rear solid discs 254/267/280/292/305mm diameter |
dual circuit with Girling vacuum servo, adjustable ratio split front to rear |
| Dimensions | ||
| length: 3.403 m (134.0") | width: 1.619 m (63.7") | height: 1.378 m (54.3") |
| wheelbase: 2.251 m (88.6") | front track: 1.312 m (51.6") | rear track: 1.286 m (50.6") |
| Rims - tires | front: 7 1/2" x 13" or 15" back: 8" x 13" or 15" |
|
| Weight | 860 kg | |
| Fuel tank | 32 lt | |
| Drag coefficient | 0.39 | |
Results in WRC
Statistics
| 1987 | 1988 | 1989 | Total | |||||||
| Total WRC results | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Races | 1 | 1 | 2 | |||||||
| Entries/finishes | 1/0 | 1/0 | 2/0 (0%) | |||||||
Races
Season
| Entry | Rally event | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Driver Codriver |
Team | MC | SVE Entry list |
POR | KEN | TdC | GRE | Oly | (NZ) | ARG | FIN | (CdI) | SR | RAC | |
| J. Margaronis C. Zikos |
dnf | ||||||||||||||
| Statistics | |||||||||||||||
| Others starts/finishes | 1/0 | 1/0 | |||||||||||||
Article from 4Τ 199, 4/1987
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Article for production
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Source
Source
Drawings
Engine
A+ engine 1275cc without turbo
Source
Transmission
Source
Source
page revision: 102, last edited: 18 Aug 2019 00:33