Red top/blue top and black top engines

obi_waynne

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Can anyone shed some light on the Red top,blue top and black top engine designations.

Presumably these are different states of tune but does this only apply to one brand of engine or one tuner or is it a code that applies to the same sort of tuning mods on any engine?

Is this a bit like stage 1,2 and 3 tuning?
 
The way I understand it is:
Ford Cosworths:
Sierra & RS500, Sapphire 2WD & 4WD (no Cat) - Red
Sapphire 4WD (Cat) - Green
Escort (large turbo) - Blue
Escort (small turbo) - Silver
 

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