CAMSHAFTS

NZ Truth, Issue 1201, 6 December 1928, Page 18

CAMSHAFTS

The reasons for t\\e adoption of overhead camshafts instead of the more familiar p'ushrods ahcj rockers jn overhead v§lv6 engines ape'not generally understood, the chjef ad* ya'ptage usually '^supied beipg that greater: speed cap be ijeyejop.-i , eel.' •'■..'■.■■ -■■■■ .-■• ■■• • ■■"- ; - ! AS a matter of fact, this is the least f? important feature, for pushrpd '-qnci overhead cam engines of identical design' m other respects dp not differ greatly m speed. •<.-■■ : '' ' . -Elimination of pushrods contributes to speed owing to the reduction irt weight improving th.c valye action, and fn most' advanced designs, such as the Stutz, rpcljers are also absent^ The deduction m moyjpg parts gained m the case of the' Stutz enSbies the efficiency of the overhead vajvp engine' to be combined with the silence and reliability of the side valve power-unit. Where cost of production is not too grave a ppiisideration, ' an ihc'ppa^jng prpiiortion of. designers of cap engines >y'iil' probably ultimately 'develop qy^rhead; camshaft models;. ;■. v ><; : ■■■ ■•