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Savremene konstrukcije motora SUS treba da zadovolje zahtev za malu potrošnju goriva i ulja za podmazivanje, pre svega zbog ekoloških a zatim i energetskih i ekonomskih razloga. Pošto se pretpostavlja da će konvencionalni motori SUS još dugo dominirati kao pogonski agregati, raznim konstrukcionim merama pristupa se smanjenju potrošnje goriva, a time i smanjenju izduvne emisije. Pre svega, radi se o optimizaciji radnog ciklusa primeni varijabilnog stepena sabijanja, primeni varijabilnog razvoda radne materije, boljim sprezanjem sa gasnim mašinama, itd. Značajan potencijal za povećanje ekonomičnosti rada motora jeste u smanjenju mehaničkih gubitaka. Najveći udeo u mehaničkim gubicima predstavlja trenje po-kretnih delova motora, pre svega delova klipno-cilindarskog sklopa. Zbog toga se posebna pažnja posvećuje izučavanju mehanizma trenja, koji je inače veoma složen. / One of demands for modern designed IC engines is low fuel and lubricant consumption because of reasons concerning ecology as well as energy and economy. The symptom is that conventional IC engines will be the first choice as a power source for numerous applications in the future. Therefore many changes and improvements in design need to be done for further decrease of fuel consumption followed by the decrease of exhaust emission. First of all, there is the optimization of the working cycle, the application of variable compression, the application of variable valve control, better coupling with gas machines, etc. Significant potential for efficiency improvement of IC engines is in reducing mechanical losses. Mechanical losses in IC engines are caused mostly by friction between the mobile parts of the engine (piston-cylinder assembly). Therefore, continual attention to the research process of studying friction problems would be necessary.