Njanji zachitsulo ndi chinthu chofunikira kwambiri pamayendedwe anjanji. Amakhala ndi mphamvu zambiri komanso amavala kukana ndipo amatha kupirira kupsinjika kwakukulu komanso kukhudzidwa pafupipafupi kwa masitima. Nthawi zambiri amapangidwa ndi chitsulo cha carbon chomwe chimatenthedwa kuti chiwonjezeke kuuma ndi kulimba. Mapangidwe a njanji amatsimikizira kukhazikika bwino ndi chitetezo, ndipo amatha kuchepetsa kugwedezeka ndi phokoso pamene sitima zikuyenda. Kuonjezera apo, kukana kwa nyengo kwa njanji kumawathandiza kuti azigwira ntchito bwino m'madera osiyanasiyana a nyengo ndipo ndi oyenera kugwiritsidwa ntchito kwa nthawi yaitali. Ponseponse, njanji ndi maziko ofunikira owonetsetsa kuti njanji zikuyenda bwino komanso moyenera.