A ~louel test appamtzrs zuus built to mecuure the i.~ltelface friction betrueen n single cam-lifier p(l,ir i.rola/ed from otlter frictional con!-po7tettLs in the uolue train. Detr~iled i?~uestigatio?zs were n~nde,for botlt co~~uenti.o~t(~l lifter (111d a roller lifter. Measured res~i1t.s shoroed an 80 percent reductioil in fj-iction with tile use of the mller 1 f k r and tlte trend of dec.rec~i,~tg frictio?~ zuitlt e~tgine speed for botlr. types of 1ifier.s. The obserued lack of friction reductior~ over any part of the cotttact cycle (i11d llle large coefj/;cient'off,-iclion in tire true of tile corl~ue~~tio~tal lifier ruled out the possibility rf elastolty(.ydro(ly~lamic lubricatio~t at the contrrct.
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