Ford Sierra XR4i group A (1984)
 Source |
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: 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 | |||||||||||||
Source
Source
Source
Source
Drawings
Source
Gearbox
Source
Suspension
Source
page revision: 55, last edited: 07 Nov 2019 05:04