HOW IT WORKS

NZ Truth, Issue 1194, 18 October 1928, Page 20

HOW IT WORKS

Overhead Camshaft

Quite frequently the term "over- ; head camshaft- appears m motor talks, and to a large number of ■ people the term is meaningless. TN the majority of cars, and of .course • •'•in all those of the side valve type, the camshaft is situated m the crankcase, above and at the of the crankshaft. . 5 • :lt is driven by two gear wheels or by 'a chain, the latter system being now very popular, principally owing to the improvement;4n the chain itself.. The ■"■- overhead ' camshaft engine is pne ip ; which the shaft . actuating y ,the 4 -.-.v'.yaiyes;'i^'.situated on top'of ..the' engine'/. fee-?ra,ly:e^ of^theK '• bverhea4sfo^fieV : r j \J. ' The overhead shaft introduces a .?rnore complicated dniv^ >bus^ it v |s ; ,; T ; ; : an improvement on the push rod V '■'. system.* : . -' - ••■ ■' '■' *> > ■.i.rids.. •*>.;:•£■■).:? Most overhead canisnafts^a'FeVdriven. ■'• by means of a vertical 'shaft, and two; .. liiuir 1 of bevel gears. A fe\o- •"'makers, -x-: however, have adopted the ;' srient.spiia.in drive. . ' '_„ . :. : '" J . Forced oil' feed has .'to be supplied to every type of overhead «a-mshuft... . „ -„, ..; , : ---^T.h|s,-xype T -p.|r-.drfva.43Hja\^^tt^ d i4^w = ,X 'rieaMy '"every- racing ■^ngine;:'ils : - if Tr&r.:-"--du.ces-i.ihe. height of the moving yar-la to ' a mi^imjdini.^i-. ,. ' . .