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).
Aspin valve design, its poor volumetric efficiency, and potential use in 2-stroke engines.
| Identifier | ExFiles\Box 134\1\ scan0222 | |
| Date | 28th June 1940 | |
| Ds. from Rm.{William Robotham - Chief Engineer} c. Wd.{Mr Wood/Mr Whitehead} c. Jnr.{Charles L. Jenner} c. Rg.{Mr Rowledge} file 1129 Rm.{William Robotham - Chief Engineer}2/10./28.6.40. Herewith a copy of a blueprint which started in your Department and to which we have added various pieces of information as it has been obtained. We have told Aspin that until he can convince us that the poor valve opening diagram is not indicative of poor volumetric efficiency, we shall not proceed further with incorporating his design in our products. It is however, clear that if the drive of the Aspin valve was arranged so that the cone could be accelerated and decelerated during each revolution, a very excellent valve opening diagram could be obtained. The very rapid initial opening of the Aspin port might conceivably be useful on 2-stroke engines in producing Kadenacy wave effects. Rm.{William Robotham - Chief Engineer} | ||