Austin MG Metro Turbo group A (1983)
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sx1.jpg Development level
Group B
Group A

VIN plates


Group/Class A/7 (1983-1987),
A/8 (1988+)
Homologation number: A5107
Years active Homologation start: 1/2/1983
Homologation end: 31/12/1992
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
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
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
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


1987 1988 1989 Total
Total WRC results
Races 1 1 2
Entries/finishes 1/0 1/0 2/0 (0%)


Entry Rally event
Entry list
J. Margaronis
C. Zikos
Others starts/finishes 1/0 1/0

Article from 4Τ 199, 4/1987

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Article for production

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1989_MG_Metro_Turbo_1.3_Front.jpg Source
mg-metro-engine-block.jpg Source



A+ engine 1275cc without turbo
aseries4.jpg Source


gearbox1.jpg Source
mg-metro-front-brake.jpg Source
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