Ford Sierra XR4x4 group A (1986)
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1.jpg Source Development chain
1984: Ford Sierra XR4i
1986: Ford Sierra XR4x4
1987: Ford Sierra RS Cosworth
1990: Ford Sierra Sapphire RS Cosworth 4x4


Group/Class A/8 Homologation number: A 5286
Years active 1987 - 1988 Homologation start: 1/1/1986
Type Cologne, V6 cyl (60o), 4 stroke, petrol engine located front longitudinal
Capacity 2793 cc WRC: 2793 cc
Bore x Stroke (mm) 93.0 x 68.5
Compression ratio 10.2:1
Output power - torgue 220 HP / 5700 rpm 41.6 kgm (276 Nm) / 4100 rpm
Main bearings 4 of 60.6mm diameter connecting rod distance between centers 130.6mm, big end bearing diameter 56.8mm
Materials block: cast iron cylinderhead: cast iron
Cams/valves 1 center camshaft with overhead valves (OHV), gears driven 2 valves/cyl. - 12 valves total. 42.35mm inlet valve diameter, 36.25mm exhaust valve diameter. 0o angle between inlet valve axis and vertical, 0o angle between exhaust valve axis and vertical. 1 coil spring per valve
Aspiration natural, Boshc K-jetronic mechanical fuel injection
Ignition electronic
Cooling system watercooled 9.5 lt
Lubricating system wet sump with 1 oil cooler 4.7 lt
Type rear wheel drive Ford Type 9, 4 or 5 speed manual gearbox
Gearbox ratios constant: 1.737/1 (33/19)
1st: 3.358/1 (29/15)
2nd: 1.809/1 (25/24)
3rd: 1.258/1 (21/29)
4th: 1.000/1 (-)
5th: 0.825/1 (19/40)
R: 3.365/1 (31/18)
constant: 1.136/1 (25/22)
1st: 2.424/1 (32/15)
2nd: 1.677/1 (31/21)
3rd: 1.227/1 (27/25)
4th: 1.000/1 (-)
R: 2.574/1 (34/15)
Diffrential ratio 3.615/1 (47/13), 3.133/1 (47/15), 4.385/1 (57/13), 3.923/1 (51/13) helical gears input epicyclical center differential with viscous coupling connected to transfer box, with 2 outputs: 1st direct output to hypoid bevel gears, ZF limited slip or Torsen rear differential. 2nd output via hyvo chain in parallel shaft to hypoid bevel gear limited slip front differential. 34%-66% front/rear torque distribution
Clutch dry, single disk 242mm diameter
Type Steel monocoque chassis with roll-cage. 3 door coupe steel bodyshell with polypropylene bumpers and plastic rear spoiler
Front suspension macpherson strut with lower transverse arm and stabilizer, coil springs and telescopic gas shock absorbers
Rear suspension semi-trailing arm with coil springs, telescopic gas shock absorbers and anti-roll bar
Steering system rack and pinion with optional power assistance
Brakes Front ventilated disks with 260mm disk diameter and 1 cast iron piston caliper, or 304mm diameter an 4 aluminium piston calipers. Rear drums with 254mm drum diameter and 1 double piston caliper, or ventilated disks with 267mm disk diameter and 2 aluminium piston calipers dual circuit with servo, adjustable ratio split front to rear
length: 4.450 m (175.2") width: 1.716 m (67.6") height: 1.392 m (54.8")
wheelbase: 2.611 m (102.8") front track: 1.452 m (57.2") rear track: 1.468 m (57.8")
Rims - tires 5.5" x 14" 195/60 VR 14
Weight 1200 kg
Weight/power 3.8 kg/HP
Fuel tank 60 lt
Drag coefficient 0.32

Results in WRC

Entry Rally event
Entry list
Stig Blomqvist
Bruno Berglund - Björn Cederberg
works exclu ded 6th acci dent
Kalle Grundel
Terry Harryman
works mecha nical
Robert Droogmans
Ronny Joosten
eng ine
Brian Stokes
John Rothery
acci dent
Geoff Fielding
John Robinson
Roderick Menzies
Martin Jeffrey
Pierre Bos
Daniel Fallot
Total points
5 5
Works starts/finishes 4/1 1/0 2/1 1/0
Others starts/finishes 5/1 1/0 1/0 3/1

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Front axle

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Rear Suspension

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