▁that ▁energy ▁at ▁a ▁much ▁higher ▁rate ▁over ▁a ▁relatively ▁short ▁time . ▁A ▁compact ▁dual - mass ▁fly w heel ▁often ▁includes ▁the ▁whole ▁cl utch , ▁including ▁the ▁pressure ▁plate ▁and ▁the ▁fr iction ▁disc . ▁ ▁History ▁▁ ▁D ual - mass ▁fly w he els ▁were ▁developed ▁to ▁address ▁the ▁es cal ation ▁of ▁tor que ▁and ▁power , ▁especially ▁at ▁low ▁re vs . ▁The ▁growing ▁concern ▁for ▁the ▁environment ▁and ▁the ▁ad option ▁of ▁more ▁string ent ▁reg ulations ▁have ▁marked ▁the ▁development ▁of ▁more ▁efficient ▁new ▁engines , ▁lower ing ▁the ▁cyl inder ▁number ▁to ▁ 3 ▁or ▁even ▁ 2 ▁cyl ind ers , ▁and ▁allowing ▁the ▁delivery ▁of ▁more ▁tor que ▁and ▁power ▁at ▁low ▁revolution s . ▁The ▁counter part ▁has ▁been ▁an ▁increase ▁in ▁the ▁level ▁of ▁v ibration ▁which ▁traditional ▁cl utch ▁disc s ▁are ▁unable ▁to ▁abs orb . ▁This ▁is ▁where ▁the ▁dual - mass ▁fly w he els ▁play ▁a ▁key ▁role , ▁making ▁these ▁mechanical ▁develop ments ▁more ▁vi able . ▁ ▁The ▁absor ption ▁capacity ▁of ▁the ▁v ibration ▁depends ▁on ▁the ▁moving ▁parts ▁of ▁the ▁DM F , ▁these ▁parts ▁are ▁subject ▁to ▁wear . ▁When ever ▁the ▁cl utch ▁is ▁replaced , ▁the ▁DM F ▁should ▁be ▁checked ▁for ▁wear . ▁The ▁two ▁key ▁wear ▁characteristics ▁are ▁free play ▁and ▁side play ▁( rock ). ▁These ▁should ▁be ▁measured ▁to ▁determine ▁whether ▁the ▁fly w heel ▁is ▁service able . ▁The ▁wear ▁limit ▁specific