Ford Sierra XR4x4 group A (1986)

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Development chain 1984: Ford Sierra XR4i 1986: Ford Sierra XR4x4 1987: Ford Sierra RS Cosworth 1990: Ford Sierra Sapphire RS Cosworth 4x4 |
Specifications
Group/Class | A/8 | Homologation number: A5285 | |
Years active | 1987 - 1988 | Homologation start: 1/1/1986 Homologation end: 31/12/1996 |
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Engine | |||
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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 |
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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) |
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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 |
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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





Drawings

Gearbox

Front axle

Rear Suspension

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