Page 7 Advertisements Column 2

Hawke's Bay Tribune, Volume XIX, Issue 65, 4 March 1929, Page 7

- v 'V ’» ■■ V# M AtMW'V *♦ 0 X»f-,- ' . 7 - -i.,;-/ < - ;.r 'W' 'r* r * ''■**■’■ ’ .A 7 MESSAGE • * INTER'EST •TO MOTORISTS, appotenic- : ap' pd-ten" ik ) The quality in a motor spirit that ensures perfect Combustion! In previous announcements the reasons for adding this word "appotenic” to the motorist’s vocabulary have been outlined. Here, we discuss the question 1 of Combustion. As a motor owner, the knowledge o f how ideal combustion is attained will prove of vital interest to you. i • * * appotenic [from / j •!<,«»»; ad (ap), meaning If* \ ™ M added to; and potens, B ' /Y/ BiweflßHlg powerful"] pos- B / B sessing increased power; °f a R as b £ ‘ng B stable to heat and high w compression will there- \ . Y -, - r<~~Cj- z ' f ore ne ' t h er audibly nor i I Ii MM silently "knock” in a BBBKBMUIL jUB LETJIMM ttixh com p ress ‘ on engine. BMMBHMNULZIOM MiitegMKKSfn ti mw Seshmmdezih ■ji Mnl This diagram shows This diagram shows correct combustion— incorrect combustion—with ‘Plume ■ with motor spirit unstable the appotenic motor spirit to heat and high compression Plume, defying high temperatures, powerfully When you use a motor spirit that is unstable resisting the disrupting influences of high com- under heat and high compression, a chemical . , i a j i -re. change takes place in the charge shortly after the pressions, burns evenly and steadily. The expan- instant of ignkion The tcmpe e rature pressure sion of the gas following this correctly-timed o f the ignited portion “A” raises the temperature combustion delivers a powerful, thrusting push to an< l pressure in the remainder of the charge to , . „ . . ~ , . such an extent that it spontaneously ignites, or the piston. It maintains this steady surge of power « goes off/ , & uncontrolled combustio 7 n . throughout the length of the power stroke, Flames rip through the charge, hitting cylinder enabling your engine to deliver its full horse- walls and piston, resulting in what is commonly power. Correct combustion follows naturally called a “knock.” Whether this “knock” is silent or audible, the propulsive power of the charge is when appotenic motor spirit is used. Plume will wasted spasmodic expansion, which the deliver maximum power without silent or audible piston cannot absorb. “knock,” despite the stress of hill climbing in Retarding the spark, or cutting down to second, t j ct may cut out the sound of the knock, but it is top gear or the heavy-load strain or low gear . , r , , ... 7 r ° ° simply a case of shutting the stable door after the “plugging” through sand or mud. horse-power’s gone. / The quality of crudes differs widely. Some crudes produce V# motor spirits unstable to heat and compression. These will spoiltaneously ignite at lower temperatures than Plume —the motor <(l spirit distilled from the appotenic crude. Plume—appotenic, heatresistant —will withstand temperatures in a combustion chamber which would cause inferior motor spirits to “knock”—either )MO I -lU Pf F W ~"' 1 audibly or silently. iW ,W Our next announcement will explain the significance of the "silent knock.” Safeguard yourself! Fill up at the Plume pump! VACUUM OIL COMPANY P™. ltd. No. 3 of a Series. Drawn from the most verdant • • ~ pastures of the Dominion, no milk i s o f suc ] x high excellence as—

Wade's Worm Figs quickly expel worms. Pleasant to take and (jbaiilulely harmless, AH Chemists am! Stores. I