Originally Posted by
gaza469
as far as im aware, the main differences between the zetec and duratec lumps is the zetecs are belt driven and the duratecs are chain driven. theres obviously loads of other small differences which make them completely different but in simple terms thats how i understand them. and that the duratec bottom ends are stronger aswel.
The 'duratec' engines found in the st170s and the focus RS (I'm not sure about the fiesta st) are just glorified zetec engines, belt driven, and tarted up. 'Real' duratecs are, as stated, chain driven, and a mazda engine.