TUNING GUIDE COSWORTH YB
The YB as we know it actually started out life as a handful of 200-300 16-valve upgrades for the Pinto, privately offered by Cosworth.
On a visit to the engine builder’s factory in 1983 to discuss F1 engines, Stuart Tuner, Ford’s Director of European Motorsports, noticed the 16-valve Pinto and started enquiring. Nobody knows for sure if the YAA engine (as it was then coded) was deliberately planted for Turner to see or not, but he did see it and Ford’s involvement in it began. Turner knew Ford needed a turbo engine to power the then-new Sierra in their Motorsport programme, so he started asking about using the Cos-worth 16-valve conversion as a starting point.
Talks progressed, and a deal was struck so that Cosworth would build the engines for the imminent Sierra RS Cosworth, and by 1984 the first YAB (turbocharged YAA) was produced.
In 1985 series production of the YBB began and, with some amendments along the way, it has been powering some mightily impressive Blue Ovals ever since.
YBenginecodes
Block
There are two main types of Cossie block; the ‘205’ and
