MOTOR NOTES.

Stratford Evening Post, Volume XXVIV, Issue 22, 31 December 1915, Page 2

MOTOR NOTES.

The lubrication of a motor cycle en,ino cylinder is ' a very ,• imjortant matter. It immediatf*y inHupnces the efficiency of .he engine, and is,.,(list‘net .in a neasure from th.e question of lubricat■ng thp bearings' and other moving parts. ! The .action which goes on withn the | cylinder, that ,is to say, the ■ reciprocating movements of the piston. d|ffep.,in its cjiaractei; from the rotary j'mptipn of a shaft in its bearing, aid it has been proved that th'e ncthod which proves successful in lubricating the, one is not always the best that can be erflployed for the other. Experiments have shown that the use of graphite in one or other of its forms gives excellent results for lubricating tie cylinder walls, but to employ it for shaft or connecting rod bearings very often means the setting 4p| if trouble. What is “required in the cylinder jis the creatioi of a liilhform pltn resulting- in a' smooth ,! atid even which ' tile 1 piston will travel in a auuinhf free from the slightest ihtferfuptioh, and a graphite emulsion is known to ensure the creation of such! a ‘surface I ,' any inequalities 1 in the cylinder wall being filled in and a path' prepared for the reciprocation'; of the piston which is of an eminently suitable character. Tender the conditions which govern frictional resistance in journals better results are attained where oil of a suitable character alone is used without the admixture of graphite or other similar substance. It, has been found by some who have, experimented in this direction that graphite lubrication in shaft hearings is liable to result in “drying up” with consequent heating of-the hearing and its attendant evils, and they therefore recommend the adoption of means for separating as it were the lubricant used in the cylinder from that employed in the bearings. How far this may he practicable. 'or whether in the case of the splash system, it would he possible to prevent the graphite from reaching the hearings it is difficult to say, but it would appear to he quite a practical scheme where deemed necessary or advisable. The condition of the cylinder walls and piston rings after a period of use with graphite lubrication is said to he superior as a rule to that evinced when oil alone is employed. The conveyance of the graphite to the is accomplished by using oil as the vehicle, and no inconveniences attend its use.