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).
The silencer system for the 20HP manifold, discussing potential designs and noise issues.
| Identifier | WestWitteringFiles\T\March1929-December1929\ Scan062 | |
| Date | 6th April 1929 | |
| RM.{William Robotham - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} ORIGINAL X5230 DA{Bernard Day - Chassis Design}1/M6.4.29. With reference to HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}5/LG27329., the standard 20HP. manifold is cast. Further the pipe at the moment goes into the centre of the silencer. Do you mean that you want a front expansion box like the SS.{S. Smith} with an intermediate expansion box in the front end of the silencer? If this is so we would/ get out a scheme for you, but the silencing system on the new 20HP. is exactly the same as the old one, and it is difficult to see why there should be a difference in the noise. Do you attribute it to the turbulent head and larger valves? DA.{Bernard Day - Chassis Design} | ||