, ▁operators ▁can ▁specifically ▁design ▁programs ▁that ▁optimize ▁fuel ▁economy , ▁emission , ▁tur bo ▁output , ▁allowing ▁for ▁high ▁performance ▁under ▁different ▁loads . ▁ ▁Rep la cing ▁the ▁Cam sh aft ▁The ▁convenience ▁of ▁the ▁cam sh aft ▁is ▁that ▁not ▁only ▁does ▁it ▁keep ▁the ▁timing ▁of ▁the ▁opening ▁and ▁closing ▁val ves ▁and ▁inject ing ▁fuel ▁through ▁its ▁c ams , ▁it ▁is ▁also ▁responsible ▁for ▁the ▁mechanical ▁force ▁that ▁is ▁required ▁to ▁actually ▁open ▁and ▁close ▁the ▁val ves ▁and ▁power ▁the ▁port ▁and ▁hel ix ▁fuel ▁p ump . ▁The ▁cam sh aft less ▁intellig ent ▁system ▁uses ▁the ▁rotation ▁of ▁the ▁engine ▁to ▁power ▁an ▁ax ial ▁p ist on ▁p ump ▁that ▁press ur izes ▁a ▁hyd ra ul ic ▁oil ▁system . ▁The ▁potential ▁energy ▁from ▁the ▁hyd ra ul ic ▁pressure ▁is ▁directed ▁by ▁the ▁electron ically ▁controlled ▁ser vo ▁system ▁to ▁drive ▁In FI ▁( Int ellig ent ▁F uel ▁In jection ) ▁and ▁In VA ▁( Int ellig ent ▁Val ve ▁Act u ation ) ▁systems . ▁ ▁Im pro ving ▁the ▁Marine ▁Dies el ▁Engine ▁The ▁Int ellig ent , ▁Cam sh aft less , ▁dies el ▁engines ▁offer ▁several ▁potential ▁improvements ▁for ▁marine ▁dies el ▁main ▁engines . ▁Variable ▁electron ically ▁controlled ▁timing ▁of ▁fuel ▁injection ▁and ▁exhaust ▁val ves ▁for ▁lower ▁specific ▁fuel ▁consumption ▁and ▁better ▁performance ▁parameters . ▁▁ ▁The ▁electronic ▁controls ▁also ▁offer ▁lower ▁R PM ▁for ▁man oe u ver ing , ▁including ▁better ▁ast