Sierra Sapphire RS Cosworth  

Available :- 1988 to 1991


Ford Sierra Sapphire RS Cosworth 2WD

Production
Approximately 13,140 examples produced during 1988-1989; Assembled in Ghenk, Belgium, with UK-built Ford-Cosworth engine.

Body
Type: Unitary steel; Sapphire 4-door saloon in Ghia trim; 170 mph speedometer; Marley design body colour-matched  front grill bumper/air dam, rear spoiler and side sill extensions
Cd: 0.33
Dimensions: Length 176.9in (4,494mm); Width 66.8in (1,698mm); Height 54.2in (1,376mm); Wheelbase 102.7in (2,608mm); Track front/rear 56.8in/57.5in (1,442mm/1,459mm); Weight 2,750 lb (1,250kg)

Engine
Type: Ford Cosworth YBB; Longitudinally mounted; 5 main bearings; water-cooled
Capacity: 1993cc
Bore/Stroke: 90.82mm/76.95mm
Compression Ratio: 8:1
Max Power: 204 bhp DIN (151kW) at 6,000 rpm
Peak Torque: 205 lb/ft (276 Nm) at 4,500 rpm
Specific Output: 102.4 bhp/litre
Power/Weight ratio: 165.9 bhp/tonne
Cylinders: 4, in-line
Cylinder Head: Cosworth design cast alloy, 16 valve toothed belt-drive, DOHC
Valve gear: Valve diameter (inlet/exhaust) 7.0mm/8.0mm; exhaust valve stems sodium filled; inclined angle 22 deg; hydraulic tappets
Block: Ford cast iron, based on Pinto block as used in Cortina etc
Ignition: Marelli level six microprocessor-managed, breakerless
Fuel Metering: Weber electronic fuel injection; Garrett AiResearch T03B turbocharger with intercooling, max boost 10psi (0.7 bar)

Transmission
Type: Front engine, rear drive
Differential: 7in Viscous coupling limited slip
Clutch: Single dry plate 9.5in (240mm), diaphragm spring, cable operation
Gearbox: Borg Warner T5 5-speed
Final Drive: Hypoid bevel, ratio 3.64:1; 22.8 mph (36.7 kph) per 1,000 rpm

Suspension
Type: front, independent MacPherson struts, coil springs, twin tube telescopic dampers; rear, independent semi-trailing arms, coil springs, telescopic dampers; anti-roll bars (28mm front, 16mm rear)
Steering
Type: Variable ratio Cam Gears/TRW rack and pinion, power assisted
Lock-to-lock: 2.6 turns

Brakes
System: Hydraulically assisted, Alfred Teves GmbH dual circuit anti-lock action
Front: 283mm, vented discs
Rear: 273mm, solid discs

Wheels and Tyres
Wheels: Unique Ford design 7J x 15in alloy
Tyres: Dunlop D40 205/50 VR 15

Performance (Manufacturer's figures unless otherwise noted)
Max Speed: 151.4 mph (243.6 kph) (Autocar, February 1988, measured 143 mph)
Acceleration: 0 - 60 mph, 6.1 seconds (Autocar, February 1988, measured a best of 5.8 seconds)
0 - 100 mph, 15.8 seconds (Autocar, February 1988)
30 - 50 mph (4th/5th gears) 6.5/11.0 seconds
Standing 1/4mile 14.4seconds/97mph
Fuel Economy: 22.1 mpg urban; 35.3 mpg at 56 mph; 27.7 mpg at 75 mph

 

The Ford RS Owners Club
PO Box 280, Upminster, Essex, RM14 9BP.
Tel: + 44 (0)8702 406215
email :info@rsownersclub.co.uk
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