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Comparison

So while they're all loosely the same, there's subtle differences between each member of the Ford Cosworth gang.  This has been carried over from my old site, and I'm verifying some of the fact and figures.

 

  Sierra Sierra Sapphire Escort
  RS Cosworth

RS500 Cosworth

2 wheel drive

4x4

(no cat)

4x4

(cat)

Large turbo

Small turbo

Year of manufacture  1986  1987 1988-1989 1989 1990-1992 1992-1994 1994-1996
Examples built  5545*  500  13,140 12,250   
Cosworth Engine code  YBB  YBD  YBB  YBJ  YBG  YBT

 YBP

Ford Engine code  N5A    N5C  N5F  
 Cam cover colour  Red  Green  Blue  Silver
BHP (Road) /RPM  204/6000  224/6000  204/6000  224/6000  224/6000  227/6250  227/6250
Torque (lb/ft) /RPM  205/4500  206  205/4500  214/3500  214/3500  220/3500  220/3500
Turbocharger Garrett T3.48  T4  T3  T3  T3B  T34  T25
Boost pressure (bar)  0.7  0.8  0.8
Intercooler  Air-Air  Air-Air
with water
spray
 Air-Air
Engine management

Weber/Marelli L1

Weber/Marelli L1  Weber/Marelli L6  Weber/Marelli L8  Weber/Marelli L8
w/lambda
control
Pectel P8  Ford EEC IV 
Clutch Dry, single plate
Gearbox  Borg Warner T5  Ford MT75
Transmission Rear wheel drive, 7 1/2 inch viscous coupled Limited Slip Differential  Permanent Ferguson four wheel drive , 7 inch viscous coupled limited slip rear differential, open front differential, 33/67 front/rear torque distribution
 Colours available

Diamond White

Black

Moonstone Blue 

Crystal Blue

Mercury Grey

Flint Grey

Diamond White

Black

Moonstone Blue

Magenta

Diamond White

Black

Moonstone Blue

Moondust Silver

Flint Grey

Smokestone Blue

Magenta

Radiant Red (very late models)

Nouveau Red

Imperial Blue

Auralis Blue

Polaris Grey

Diamond White

Aubergine

Mallard Green

Stardust Silver

Black

Radiant Red