DRAGSTER ENGINE The piston on the left was taken out of a dragster engine after 70 runs without Bi-Tron. The piston skirt has a severe scuffing. The piston on the right was taken out of an engine after 350 runs with Bi-Tron. The piston has no signs of wear, is completely clean, and all the friction surfaces are polished! Crankshaft area on which the piston-rod bearing slides. After 350 runs the surface is mirror-polished and has no signs of wear. A close-up of an upper end of a piston after 350 runs with Bi-Tron Engine Treatment. Since in Dragsters it is prohibited to use any fuel conditioners, only Engine Treatment was used. As you can see, there is carbon deposit above the upper ring, but none under it and lower. The ring surfaces are polished and clean. The cylinder skirt is completely clean. Because of the polishing effect of Engine Treatment, the tighter seal of the piston rings prevented the penetration of combustion gases into the oil system. A close-up of a liner wall of one of the cylinders. After 350 runs, totally clean and polished. In all the cylinders you can find traces of cross honing pattern of the original bore, indicating that virtually no wear took place.