Ford Sierra XR4x4 group A (1986)
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Home » Rally Cars » Ford Sierra XR4x4
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1984: Ford Sierra XR4i
1986: Ford Sierra XR4x4
1987: Ford Sierra RS Cosworth
1990: Ford Sierra Sapphire RS Cosworth 4x4

Info
Cologne info

Specifications

Group/Class A/8 Homologation number: A5285
Years active 1987 - 1988 Homologation start: 1/1/1986
Homologation end: 31/12/1996
Engine
Type Ford Cologne 2.8, V6 cyl (60o), 4 stroke, petrol engine.
1989: Ford Cologne 2.9		 located front longitudinal
Capacity 2794.9 cc
1989: 2937.6 cc		 WRC: 2794.9 cc
1989: 2937.6 cc
Bore x Stroke (mm) 93.05 x 68.5, 1989: 93.05 x 72.0
Compression ratio 9.7:1, 1989, 2.9 lt: 10.5:1
Output power - torgue 220 HP / 5700 rpm 41.6 kgm (276 Nm) / 4100 rpm
Main bearings cast iron crankshaft with 4 main bearings 60.6mm diameter, big end journals diameter 54mm connecting rod distance between centers 130.6mm, big end bearing tunnel diameter 56.8mm, aluminium alloy piston with 40.1mm compression height. 1989, 2.9 lt: 39.2mm compression height
Materials block: 83TM6015AA cast iron, with optional cast iron "dry" cylinder liners. 120.9mm bore spacing, 205.3mm deck height, 224mm height cylinderhead: cross flow cast iron with "square" shaped combustion chambers and 2x2 exhaust ports (2 cylinders in 1 port, 1 cylinder in 1 port), 73mm height. 1989, 2.9 lt, 2x3 exhaust ports
Cams/valves 1 side camshaft located inside Vee with overhead valves (OHV), chain 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, Bosch K-jetronic mechanical multipoint fuel injection.
1987: depending on countries legislation, Bosch L-jetronic electronic dual (2) points fuel injection (2 injectors).
1989: Weber/Bosch EEC IV electronic multipoint fuel injection (2.9 lt)
Ignition electronic, firing order 1-4-2-5-3-6
Cooling system jacketed watercooled with pump, radiator, 2 fans (8 blades 406mm diameter, and 11 blades 285mm diameter) and thermostat.
1989, 2.9 lt: 9 blades 420mm diameter, and 10 blades 400mm diameter		 9.5 lt
Lubricating system wet sump with 1 oil cooler 4.7 lt
Transmission
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 (31/16)		 1987: constant: 1.091/1 (24/22)
1st: 2.649/1 (34/14)
2nd: 1.909/1 (28/16)
3rd: 1.515/1 (25/18)
4th: 1.227/1 (27/24)
5th: 1.000/1
R: 2.961/1 (38/14)		 1989, 2.9 lt: constant: 1.32/1 (33/25)
1st: 3.61/1 (41/15)
2nd: 2.08/1 (41/26)
3rd: 1.36/1 (32/31)
4th: 1.000/1
5th: 0.83/1 (27/43)
R: 3.26/1 (37/15)
Diffrential ratio Front/rear differentials: 3.615/1 (47/13), 4.33/1 (39/9), 3.923/1 (51/13), 1987: 4.667/1 (42/9), 4.889/1 (44/9), 4.444/1 (40/9), 5.111/1 (46/9), 3.083/1 (37/12), 3.250/1 (39/12), 3.417/1 (41/12), 3.636/1 (40/11), 3.818/1 (42/11), 4.091/1 (45/11), 4.273/1 (47/11), 5.125/1 (41/8).
1989: 4.57/1 (32/7), 4.43/1 (31/7), 4.12/1 (33/8), 3.86/1 (27/7), 3.63/1 (29/8).
Transfer box: 1:1.
1987: 34/24, 34/25, 31/24, 32/26		 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 disc 242mm diameter
Chassis-body
Type |Steel monocoque chassis. 35kg aluminium (D40x5mm) roll-cage. 1987: 32.5kg steel CDS2 (D38x2.64 and D34.5x2.64mm) plus aluminium HE30TF (D38x4.7mm) roll cage. 5 door hatchback steel bodyshell with steel doors, steel front/rear bonnets, plastic front/rear bumpers and plastic rear spoiler.
1992: all aluminium roll cages cancelled
Front suspension macpherson strut with lower transverse arm and stabilizer, or 2 links form "A" shaped wishbone, coil springs and telescopic gas shock absorbers, separate anti roll bar 6 to 32mm diameter
Rear suspension semi-trailing arm with coil springs, telescopic gas shock absorbers and anti-roll bar 6 to 32mm diameter
Steering system rack and pinion with hydraulic power assistance 13.71/1 ratio. 1987: 12.8/1 ratio
Brakes Front ventilated discs 260mm diameter with 1 cast iron piston caliper 60mm diameter, rear solid discs 252mm diameter with 1 cast iron piston caliper 42.8mm diameter.
Front/rear ventilated discs 302mm diameter with 4 AP aluminium piston caliper 2x38.1+2x41.3mm pairs diameter, plus 1 caliper for hand break.
1987: Front/rear ventilated discs 285/315mm diameter with 4 AP aluminium piston caliper 32/36/38.1/41.3/(2x38.1+2x41.3)mm pairs diameter. Front/rear ventilated discs 330mm diameter with 4 AP aluminium piston calipers 2x38.1+2x41.3mm pairs diameter.
1989: Front/rear ventilated discs 330mm diameter with 4 AP aluminium piston calipers 31.7/34/36/38.1/41.3/(2x38.1+2x41.3)/(2x44.5+2x41.3)mm pairs diameter		 dual circuit with Ford/Teves/Girling/Bendix vacuum servo and Anti Block braking system (ABS), adjustable ratio split front to rear. 2 master cylinders for brakes and clutch operation. 1989: front brake air cooling duct
Dimensions
length: 4.459 m (175.6") width: 1.725 m (67.8") height: 1.392 m (54.8")
wheelbase: 2.612 m (103") front track: 1.468 m (57.8") rear track: 1.465 m (57.5")
Rims - tires 5.5" x 14" 195/60 VR 14
Weight 1200 kg
Fuel tank 60 lt
Drag coefficient 0.32

Results in WRC

Season
Entry Rally event
Driver
Codriver		 Team MC SVE
Entry list		 POR KEN TdC GRE NZ ARG FIN (CdI) SR RAC (Oly)
Kyösti Hämäläinen
Martti Putkonen		 trans mission*
James Ingleby
Campbell Roy		 40th
Ian Donaldson
Richard Taylor		 48th*
Christopher Rees
Malcolm Heymer		 75th*
Rex Muldoon
Kim Bannister		 acci dent*
Statistics
Others starts/finishes 1/1 1/1

*Group N4 entries

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Drawings

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Gearbox

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Front axle

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Rear Suspension

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page revision: 57, last edited: 15 Aug 2019 19:38
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