Bisbee daily review., 1921-05-01
SIMMONS TELLS : OF. CARBON AND
 ITS. REMEDIES

EVery enthusiastic mOtOrlSL enjoys the sharp, clear bark of a powerful,
 sweet-running motor. A hot spark in every cylinder Valves opening wide
 and sealing tight! Just the right
 mixture from the carburetorI If
 your motor seems to be losing its hill
 climbing pep; if you have to work to
 get it started; if the compression
 seems to be getting weaker, there's
 chance that the trouble is due to car
 bonized valves. Carbon makes the valves stick, pits and burns them,
 causing them to leak, etc. Yes, carbon is the little joy killer!" says Ed Simmons of the Cochise Mo tor Company. Tt performs all the above mentioned evil functions. It
 also causes Knocking in the cylinders, 1 overheating, warped valve stems, leaky valves, etc. But the summation [ of all Of these is simply the cause of | one most important effect-loSs of 1 power.
 1. Carbon is the direct result of im- proper combustion. For the complete 1 combustion of any fuel there is def I mite minimum quantity of oxygen re-
 Quired. This oxygen is generally sup piled from the air Limiting the air supply, so that the minimum quantity | is not mixed with the fuel causes the | formation of carbon.
 1 Tn automobile engine cylinders, carbon is formed in several ways. | Chiefly, it is due to the use of a mix
 ture from the carburetor consisting of
 too high a proportion of gasoline Such rich mixture burns improp- | erly when ignited by the spark, leav.
 ing a soft deposit of black material
 which collects on top of the piston and in the clearance space at the top 1 of the cylinder. It enters evory angle forming around the spark plug bush
 ings. valves. etc.
 i If oil works up around tho piston i rings into tho explosion chamber. it
 will burn, and, being unmixed with air (the supporter of comhustion)
 will be only partially burned-incom. plete notwithstanding in carbon | deposit.
 Generally, the first indications of i such ar accumulation in the cylinders i appears in the form of knocking" | The continued piling up of layers of l carbon. under the action of the high 1 pressures and temperatures existing
 in the cylinder chamber, causes a
 hard scale to be formed, Occasional
 ly the scale becomes hot enough at some point to ignite the fresh charge as it enters the cylinder. A preIna-
 ture explosion occurs. Its rapid repe- tition comes in the form of knock { ing" which can hardly be overlooked As the carbon accumulates in ov-
 cry nook and crevice to which it can | possibly find its way, some of it de- posits on the lower part of tho spark
 plugs. It short circuits tho spark and
 prevents the formation of the spark | at tho proper point 'Missing' in
 any one cylinder readily identifies
 this condition.
 Until recent years it was custom ary to remove carbon deposits by oyerhauling the motor and lis parts, and by scraping by hand. This meth
 cd was very expensive, entauing as it did. the complete dismantling of tho engine
 But tho oxygen process %as put into the hands of all automobile own CTS a simple and convenient process whereby automobile engines can be
 kept, at all times, in the condition
 described in the opening paragraph
 The name by which the process is designated is 'decarbouiNng It is by
 far the cheapest aud most cxpcdieut
 way of removing carbon from the cyl finders And the process ie performed without the slightest pos5ibls danger If injury to the cylinder or any of the engine parts
 The principle upon winch decar> boniLIng IS based is the simple chem iCsl reaction which occurs when pure
 o2-s sen and carbon aye trough into contact with each other under ths in-