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).
Comparison of valve port areas for various engines, including the Aspin valve and the B.60.
Identifier | ExFiles\Box 134\1\ scan0229 | |
Date | 10th June 1940 | |
Jnr.{Charles L. Jenner} from Rm.{William Robotham - Chief Engineer} 1129. Rm.{William Robotham - Chief Engineer}14/ML.10.6.40. Here is DES.8874 showing the valve port area of various engines. We should like to get a direct comparison, with our timing, of the Aspin valve opening, against the valve opening of B.60. Fletcher has the Aspin valve for measurement. We should like also to see what the valve would have to be like to get equal opening area to the best we can do with the single valve. Rm.{William Robotham - Chief Engineer} | ||