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Show iIGH FLASH POINT AN EXPLODED THEORY -'lubrication Oil for Gas. Motors Does Not Have to Stand Heat Test, "It is an old theory that was never winded on solid facts that a high flash oint is a necessity in a motor oil or ae oil will bum without giving any jbrication." says Lieutenant G. S. ryan in the Journal of American So-letr So-letr of XavaJ Engineers. He conquest con-quest The point was overlooked that when we have a maximum temperature tempera-ture of the gases in the cylinder of 2700 degrees Fahrenheit and an average temperature of 950 degrees de-grees Fahrenheit, an oil with a nah point of 450 degrees Fahrenheit Fahren-heit will offer but little more re-sdstan.ee re-sdstan.ee to burning than would one of 350 degrees. Either oil will burn if kept for any length of time in contact with the hot gas. Lubricating oil does ' not Jburn very easily or very fast, however, and the time given for it to burn in a motor cylinder is very short. A thin film of oil , smeared on a hot (300-degree) piece of iron or steel will burn for several nf seconds if ignited. Few motors ever run at less than .120 revolu- - tions per minute, and at this rate the average point of lubricated surface on the cylinder well would be exposed to the action of the flame for only one-quarter of a sec- ond. It is easily seen that there is no danger of all the oil film being burned in that short time, though there is no doubt that some iC of it is burned, whether the flash point is 300 or 500 degrees Fahrenheit. Fahren-heit. At high speeds the time allowed al-lowed the oil" to burn in is so small a fraction of a second that Te need not worry on this score. |