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).
Using a vacuum in the exhaust pipe for a 2-stroke valveless engine.
| Identifier | ExFiles\Box 79\2\ scan0090 | |
| Date | 12th June 1920 | |
| Contd. -2- 12.6.20. As we can produce a good vacuum in the exhaust pipe a 2 stroke valveless engine can be used without any crank-case compression or open crankcase. | ||