Page 13 Advertisements Column 3

Sun (Auckland), Volume III, Issue 623, 27 March 1929, Page 13

Drive on PlumeA the cIPIIOtCII I C“Motor Spirit and enjoy the benefits of* H!G!f COMPRESSION era „rt CO mb US' ,S 4 %&*’**“ - &&&** 'o r e r^» u V. „ XK.T£f f e sp\vsbsp\vsb bjaMWi^ **From the Latin: ad lap), meaning added to; and potens, meaning powerful, appotenic possessing increased power; said of a gas that, being stable to heat and high compression, will therefore neither audibly nor silently “knock" in a high compression engine. correct'P°^ b c U aP poien>c Plume, igh co*®. aiures, eve nb' a ” Jg gas CorrectJ rally buStto \Atenic »' ot ,°, r J c livcr when a*P %' e t vtil ie '\ j glume wui . thoU t sfe\jar-*rfi lent or esptte V-V----iitnbiuS • j heavy'’ •SU Sk*s' lent .° tlSz stre Jor the Jnshtte \ to p gear o stro i” through / SUCH \ COMPRESSIONS \ POWER-i 5 rappoteiuc | HIGH compression means greater propu!si\e power provided only that ignition and combustion of the charge take place correctly. The efficiency of some motor spirits is reduced through their inability to resist the disruptive influences of the terrific heat developed by high compression. These influences cause motor spirits unstable to heat to spontaneously ignite in uncontrolled combustion: (See the smaller illustration.) Violent expansion follows, springing the cylinder walls, and causing that high-pitched “ping” known to motorists as fuel knock, with consequent loss of power. Both you and your car will get the full benefit ofhigh compression if you drive on Plume the appotenic Motor Spirit. The appotenic quality powerfully resists the action of heat, and worTes in perfect power-partnership with high compression engines. (See correct combustion illustration.) High compression and appotenic Plume mean more power, greater flexibility, Jess gear-changing, fasteracceleration, and lessened depreciation because of a gratifying absence of knocking. Here’s the surge of power that you should have for modern, niotoring conditions. A tank full will prove, every claim. pLUM The appotenic Motor Spirit.ji / «// VACUUM OIL COMPANY PTY. LTD.