OCR Text |
Show Cause of Motor Knocks Explained by Scientist Motors "knock" because of the very rapid burning of tiny drops of the fuel containing peroxides, formed during compression, believes Prof. E N. da C. Andrade. whose lectures on engines before the royal instil ut ion in London are attracting wide attention. Professor Andrade fays there are at least 14 theories as to the causes of the "knock" which is so disconcerting to automobilists. He inclines to the one mentioned and says that regard les? of the cause, certain chemicals, among wlikh may lie named lead otliide and Iron carbonyl, if put into the petrol In quite small quantities will cause It to occur more easily. As the use of the "anti-knork" sub stances allows the use of a higher compression. Professor Andrade believe? be-lieve? there is a great future for the development of this method of increasing in-creasing efficiency. |