Kutalika kwamtunda kwa korona wa piston kwawonjezeka pakapita nthawi kuti muteteze silinda. Chifukwa cha kuchuluka kwa malo apamwamba, ma depositi pamwamba pa nthaka akhala ovuta kwambiri kusiyana ndi injini zazifupi zamtunda. The PC-ring yayambitsidwa kuyambira 2000.

Mphete yotsuka pisitoni imayikidwa pamwamba pa cylinder liner. Mphete yotsuka pisitoni imayikidwa kuti itetezere kuchulukitsa kwa depositi pamwamba pa pisitoni pamwamba pa korona pochotsa ma depositi pomwe pisitoni ikuyandikira pamwamba pakufa (TDC).
Mphete zotsuka pisitoni zimasinthidwa ndi kudzikundikira kwachidziwitso.