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).
Page discussing potential engine redesigns regarding the rotary valve, ports, and piston friction for improved performance.
| Identifier | ExFiles\Box 54\4\ Scan032 | |
| Date | 12th July 1928 | |
| R.R. 493A (40 H) (SL 42 12-7-28). J.H.D. -5- EXPERIMENTAL REPORT. Expl. No. REF: Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} /LG5.9.24. possible by altering the period and timing of the scavenging port. It seems, however, as if it will be necessary to completely re-design the rotary valve if any B.HP. is to be obtained or high speed work indulged in, as the mechanical efficiency at present is impossible. For thermal efficiency, the exhaust valve period and timing may require attention while the fact that the long transfer port is part of the combustion chamber will be bad for this factor. Piston friction will also be a serious factor at higher speeds. DICKINSON BOND Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} | ||