Ford Escort Mk II RS group 4 (1975)
 Source |
Development chain 1976: Ford Escort Mk II RS 1980: Ford Escort Mk III RS1700T 1997: Ford Escort Mk V WRC 1997: Ford Escort Mk VI Maxi |
Development level Group 4 Group 2 |
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Table of Contents
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In rallies: see video
Click here (book)
Portugal register
Specifications
109 road cars built (RS1800)
Click here
Click here and here and here
Click here and here and here for street version
Click here and here and here and here for engine info
| Group/Class | 4/3 | Homologation number: 1605 and 650 | |
| Years active | 1975-1981 | Homologation start: 1/5/1975 (18/4E) and 1/4/1977 Homologation end: 31/12/1982 |
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| Engine | |||
|---|---|---|---|
| Type | Cosworth BDA 1.84 or BDG, straight 4cyl, 4 stroke, petrol engine | located front longitudinally | |
| Capacity | 1840 or 1975 cc | WRC: 1840 or 1975 cc | |
| Bore x Stroke (mm) | 86.88 or 90.0 x 77.62 | ||
| Compression ratio | 11.5:1 | ||
| Output power - torgue | RS1800: 190 HP @ 7500 rpm, Group 2 & carburetors: 234 HP / 172 KW @ 8200 rpm Group 4 & carburetors: 240-265 HP / 8000 rpm asphalt: 275 HP / 9000 rpm |
RS1800: 138 ft/lb @ 6500 rpm, Group 4 & carburetors: 22.1 kgm (217 Nm) / 6750 rpm asphalt: 24.2 kgm (237 Nm) @ 6900 rpm |
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| Main bearings | 5 with 54mm bearings diameter | Connecting rod length 5.230" (132.842mm), big end type bearing diameter 49.215mm | |
| Materials | block: Ford Kent aluminium alloy block with thin-wall steel cylinder liners, 209mm deck height and 96mm bore spacing (casting H721F-6010AA) | cylinderhead: Cosworth BDG cross flow aluminium alloy with hemispherical combustion chambers | |
| Cams/valves | 2 overhead camshafts (DOHC), belt driven | 4 valves/cyl. - 16 valves total, 31mm inlet valve diameter, 25.65mm exhaust valve diameter, 1 coil springs per valve | |
| Aspiration | natural, 2 x Weber 36 DGAV, or 2 x Weber 48 DCOE carburetors, or Lucas or Bosch multipoint mechanical fuel injection | ||
| Ignition | Lucas or Luminition electronic, firing order 1-3-4-2 | 12 or 24V Starter motor circuit | |
| Cooling system | jacketed watercooled with pump, radiator, 299 mm diameter-8 blades fan and thermostat | 6.1 lt | |
| Lubrication system | dry sump with 2 oil pumps | 4.6 lt | |
| Transmission | |||
| Type | rear wheel drive | ZF 5S18/3, 5-speed manual gearbox | |
| Gearbox ratios | constant: 0.968/1 (30/31) 1st: 2.298/1 (38/16) 2nd: 1.798/1 (39/21) or (1978+) 2nd: 1.599/1 (38/23) 3rd: 1.355/1 (35/25) 4th: 1.141/1 (33/28) 5th: 1.000/1 (-) R: 2.909/1 (32/11) |
Group 4: constant: 1.259/1 (34/27) 1st: 3.874/1 (40/13) 2nd: 2.398/1 (40/21) 3rd: 1.763/1 (35/25) 4th: 1.259/1 (30/30) 5th: 1.000/1 (-) R: 2.909/1 (32/11) |
4 first gears from any below combination: 3.36/1 (29/15 x 33/19) 2.8/1 (26/18 x 29/15 ) 2.792/1 (26/18 x 29/15) 2.293/1 (26/18 x 27/17) 1.81/1 (24/13 x 33/19) 1.81/1 (25/20 x 29/20) 1.575/1 (26/18 x 24/22) 1.510/1 (26/18 x 23/22) 1.39/1 (23/24 x 29/20) 1.384/1 (26/18 x 23/24) 1.27/1 (33/19 x 19/26) 1.264/1 (26/18 x 21/24) 1.155/1 (26/18 x 20/25) 5th: 1.000/1 (-) 1977: 2.052/1 (26/18 x 27/19) 1977: 1.213/1 (26/18 x 21/25) R: 2.909/1 (26/18 x 32/11) |
| Diffrential ratio | Production axle: 3.444/1 (31/9), 3.71/1 (34/9), 3.54/1, 3.77/1, 3.889/1 (35/9), 4.125/1 (33/8), 4.44/1 (40/9), 4.7/1 (33/7), 5.14/1 (36/7), 5.28/1 (37/7), 5.5/1 (39/7), Heavy duty axle: 3.09/1, 3.22/1, 3.444/1 (31/9), 3.75/1, 3.89/1 (35/9), 4.11/1 (37/9), 4.375/1 (35/8), 4.63/1 (37/8), 4.86/1 (34/7), 5.14/1 (36/7), 5.28/1 (37/7), 1976: 3.56/1 (32/9) 1977: 3.7/1 (37/10), 4/1 (36/9), 5.375 (43/8), 5.83/1 (35/6) |
hypoid spiral bevel gears limited slip rear differential. Oil cooler for rear axle | |
| Clutch | dry single plate 203 mm diameter, or double plate 184 mm diameter (CP2604), Group 4: triple plate | ||
| Chassis-body | |||
| Type | steel monocoque chassis with roll-cage. 2 door saloon steel bodyshell with extended wheel enlarged arches and coated steel bumpers | ||
| Front suspension | Macpherson strut with 1 lower transverse arm and stabilizer, coil springs and telescopic gas shock absorbers | ||
| Rear suspension | live axle with 4 locating longitudinal links, Panhard rod, multiple leaf springs and telescopic gas shock absorbers | ||
| Steering system | rack and pinion | 2.4 turns lock to lock | |
| Brakes | front ventilated disks with 265 or (1978+:) 279/292/300mm diameter and 4 piston calipers AP Racing CP2361 (Forestry) or CP2270 (Monte Carlo). Rear drums 229mm diameter, or solid or ventilated disks 244/254/265/292mm diameter with 2 or 4 (38mm) piston calipers, AP CP2382 (vented discs) or AP CP2383 (solid discs) | dual circuit with servo, adjustable ratio split front to rear | |
| Dimensions | |||
| length: 3.978 m (156.6") | width: 1.607 m (63.2"), Group 4: 1.700m (66.9") |
height: 1.384 m (54.5") | |
| wheelbase: 2.407 m (94.75") | front track: 1314.5 mm (51.75") | rear track: 1333.5 mm (52.5") | |
| Rims - tires | front, 6x13", rear 7x13", or 15" | 175/70 HR 13, 195/50-R15 | |
| Weight | 980 - 1040 kg | ||
| Weight/power | 3.9 kg/HP | ||
| Fuel tank | |||
| Drag coefficient | 0.45 | ||
Results in WSCC
Group 2, BDA 1840 cc engine
Season
| Car entry | Car number/ result | |||||||||||||
| Mugello | Valle lunga | Silver stone | Nurb | Zeltweg | Watkins Glen | Dijon | ||||||||
| Team | 6h | 6h | 6h | 1000km | 6h | 6h | 6h | |||||||
| Derek McMahon racing | #56, dns | |||||||||||||
| Tony Brennan/ Arthur Collier | #58, 9th (1st) | |||||||||||||
| Total points 2 |
2 | |||||||||||||
| Statistics | ||||||||||||||
| Works Starts/finishes 2/1 | 2/1 | |||||||||||||
| Driver | Team entries and car number | |||||||||||||
| The Lep Group of Companies | #57, OTL | |||||||||||||
| Derek McMahon racing | ||||||||||||||
| Alec Poole | 57 | |||||||||||||
| Derek McMahon | 57 | |||||||||||||
Results in WRC
Races
Works team: Ford Motor Co
Group 2
| Entry | Rally event | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Driver Codriver |
Team | M.C | SVE | KEN | GRE | MAR | POR | FIN | S.R | TdC | RAC | ||||
| Timo Mäkinen Henry Liddon |
works | 3rd | tires | 1st* | |||||||||||
| Roger Clark Jim Porter |
works | tires | 2nd | ||||||||||||
| Billy Coleman Dan O'Sullivan |
Thomas Motors of Blackpool | 6th | |||||||||||||
| Ari Vatanen Peter Bryant |
Independent Radio News / Motocraft | acci dent | |||||||||||||
| Russell Brookes John Brown |
Birmingham Post / Andrews Heat for Hire | dnf | |||||||||||||
| John Taylor Mike Broad |
Haynes of Maidstone | dnf | |||||||||||||
| Russell Close Colin Wilson |
Team Avon Tyres | dnf | |||||||||||||
| Jill Robinson Dilys Rogers |
Team Avon Tyres | dnf | |||||||||||||
| John Cockerill John Lawson |
ICI Petrol | dnf | |||||||||||||
| Total points () |
32 | 8 | 24 | ||||||||||||
| Statistics | |||||||||||||||
| Others starts/finishes | 12/4 | 1/1 | 2/0 | 9/3 | |||||||||||
*Allied Polymer Group entry
SourceRoger Clark in first appearence in Granite City rally '75
SourceHannu Mikkola in RAC rally '80
Drawings
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Chassis and body
page revision: 347, last edited: 16 Mar 2019 20:12