From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from Olds Motor Works to Mr. W.A. Robotham regarding their opinions on engine valves.
| Identifier | ExFiles\Box 158\4\ scan0282 | |
| Date | 16th December 1938 | |
| Original in 1360 Rm{William Robotham - Chief Engineer}'s American file Files SWDL{Len H. Swindell} COPY. OLDS MOTOR WORKS DIVISION GENERAL MOTORS CORPORATION, LANSING, MICHIGAN. December 16th. 1938. Mr. W.A.Robotham, Rolls-Royce Ltd., Derby, England. Dear Mr. Robotham: Replying to your letter of December 2 regarding general information on valves, you might be interested in some of our general opinions. We have not had any particular experience with sodium-cooled exhaust valves; however, might state that if valves are running hot enough to preignite, the remedy is probably necessary in your cooling system. Nor has it been our experience that the higher exhaust valves are advantageous as the general tendency has been to decrease the length of the valve guide to eliminate valve sticking. I do not believe that temperature of the valve is particularly sensitive to the port shape if the port is not restricted, and we have also found that the tulip valve is not advantageous as far as intake gas flow is concerned. We have not had any extensive experience with hydraulic valve adjusters upon which we could draw any opinions as to their effect on valve temperatures. I am sure that Mr. Caldwell of Thompson Products in Cleveland, Ohio, which is one of our sources on valves, would be glad to give you his opinions on some of these questions if you wrote to him. Sincerely yours, H.T.Youngren Chief Engineer. HTY:tl. | ||