The pistons and connecting rods used in the YC Zetec were engineered and supplied by Cosworth UK. The pistons are manufactured from proprietary alloy called designated by Cosworth as COS AL 010, utilize an green anti-scuff skirt coating and a 84.8 mm bore size. It would be good to note that the pistons utilize a larger 22mm piston pin and will not fit a stock or even aftermarket performance connecting rod. They where designed to be used exclusively with the Cosworth YC long connecting rods.





The rods themselves where manufactured for Cosworth by Pankl Racing of Austria. They weigh in at 268 grams much lighter than the 535 grams of a stock connecting rod and are substantially longer to accommodate the extended cylinder liners of the YC CGI engine block. Again this rods will not work with any other piston besides the YC piston used in the WRC Focus.