Ford Sierra XR4i group A (1984)
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ford-sierra-xr4i-rallyes-de-regularidad.jpg Source Development chain
1984: Ford Sierra XR4i
1986: Ford Sierra XR4x4
1987: Ford Sierra RS Cosworth
1990: Ford Sierra Sapphire RS Cosworth 4x4

Cologne info here and here

Specifications

Group/Class A/8 Homologation number: A5238
Years active 1984 - 1985 Homologation start: 1/7/1984
Homologation end: 31/12/1991
Engine
Type Ford Cologne 2.8, 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 9.7:1, 10.2:1
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
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
Cams/valves 1 side camshaft located inside Vee 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, Bosch K-jetronic mechanical multipoint fuel injection
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 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)
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), 3.14/1 (47/15), 4.385/1 (57/13). 1985: 3.92/1 (51/13) hypoid spiral bevel gear limited slip rear differential
Clutch dry, single disc 242mm diameter
Chassis-body
Type Steel monocoque chassis with roll-cage. 3 door coupe steel bodyshell with steel doors, steel front/rear bonnets, plastic front/rear 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 hydraulic power assistance 19.88/1 ratio (no servo). Cam Gears 17.14/1, or ZF 16.77/1 ratio (with power assistance)
Brakes Front ventilated discs 260mm diameter with 1 cast iron piston caliper 60mm diameter, rear drums 254mm diameter with 1 double cast iron piston caliper 22.2mm diameter.
Front ventilated discs 304mm diameter with 4 aluminium piston caliper 42.8mm diameter, rear ventilated discs 267mm diameter with 2 aluminium piston calipers 38.1mm diameter, or 2 cast iron piston calipers 33.9mm diameter
dual circuit with Ford/Teves/Girling/Bendix vacuum servo, adjustable ratio split front to rear
Dimensions
length: 4.459 m (175.6") width: 1.728 m (68.0") height: 1.392 m (54.8")
wheelbase: 2.608 m (102.7") 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
Fuel tank 60 lt
Drag coefficient 0.32

Results in WRC

Season
Entry Rally event
Driver
Codriver
Team M.C SVE
Entry list
POR KEN TdC GRE N.Z ARG FIN S.R (CdI) RAC
Grosson
Roux
dnf
Statistics
Others starts/finishes 1/0 1/0

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gpa0001.jpg Source
beam2.jpg Source
2008-11-06_204604_fof1.gif Source

Drawings

Sierra_XR4i.jpg Source

Gearbox

type-9-gearbox-cross-section.jpg Source

Suspension

C1.25.gif Source
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