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Show C"iyri'jh.l, lH?t . hi; the 1 ntrrnatirynal Svttrficntc The Quickly Carbonizing Engine (Continued) The Oii' i'titoi's Cimtnl Of Fuel Anil Oil Affects Thin yyi I1KX ON 10 SI'.ES VOLUMES of black smoke pouring from the tag mulllm- pipe, it is certain that not all the soot is escaping, but 2 "'at -0U1L' remains in the cylinders to form deposits and Therefore V-yr the use of overrirh mixtures should be avoided, the carburetor .-tionld b set as lean as practicable for all speeds and throttle openings and the choker used only when absolutely necessary. Engines should be warmed up as expeditiously as possible and kept as nearly up to their full working temperature as may be and hot air connections and intake heating devices kept in working condition, so as to secure as dry a fuel mixture as is obtainable. Low grade oil or oil that is too much thinned by crank-case dilution is a factor in causing rapid carbonization because its presence above the pistons furnishes material from which solid residue can readily be formed by the action of heat. An excessively Sigh oil level, unduly high oil pressure or anything that contributes to "oil pumping" so loads the combustion spaces with lubricant that solid Biaierials build up quickly on their surfaces. There is every reason to Iellcve that different grades of fuel show varying rates of carbon deposition and In the absence of accurate Information upon the subject, the more volatile grades may safely be chosen. Carbon formation can be discouraged by the periodic use of kerosene or other solvents. WON'T START WITHOUT HOT V ATElt C. I. writes: My Ford engine Is almost impossible, to start, when cold, without using hot water and I have been urged to put on a carburetor, which it is claimed will i enable me to make not less than 3-i in. p. g. and will render starting much easier. What do you think about this? Answer: If your car is in perfect per-fect condition, It might show this i high gasolino economy, under fav-orablo fav-orablo conditions, with this carburetor, car-buretor, but we hesitate to believe that your average results would be nearly as good as this. Perhaps you could get a free trial of this carburetor. Your starting difficulties difficul-ties may not arise from the carburetor, car-buretor, if your present one Is of standard make and in good order, but may be caused by intake leakage, leak-age, failure of the clfcker to close tightly, poor spark-plug cores, too wide spark-plug gaps, faulty coil adjustment, weak magneto, thickened thick-ened oil on the timer, dirty magneto mag-neto contact or some other defect. A good manifold primer would perhaps per-haps help enough in starting, so that a change of carburetors would prove needless. Qttesftons of general interest tt Mr. Clough in this column, space pei desired, enclose self-atldressed, stamp CONCERNING DATA ON OILS O. S. R. asks: is there any source of information as to which brands of engine oil are the best? Is It a fact that the oil which gives the most miles of service per quart, is the best? Is a so-called paraffin base oil the best? Answer: We know of no published pub-lished information as to the relative rela-tive merits of various brands of oil. Some data has been given out as to the physical qualities of samples of different brands, but this is hardly hard-ly of direct value to the ordinary user. Some of the big concerns that operate large fleets of cars and maintain testing departments have valuable practical data on oils, but this information is difncult to obtain. ob-tain. Assuming high lubricating qualities when fresh, it is probably safe to say that the oil which will give the most service with the least change in its qualities is the best oil. There is less stress placed now than formerly upon the character of the crude from which an oil la refined and it is quite generally admitted ad-mitted that oils of equal excellence can be produced from crudes of very widely different type, by suitable suit-able processes of manufacture. the motorist will 6c answered by 'mitting. If an immediate answer is ied envelope. |