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).
Experimental mock-up to fit two Bentley air silencers to a Spectre car to cure induction roar.
| Identifier | ExFiles\Box 93\2\ scan0029 | |
| Date | 23th January 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} +305 Hs{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager}5/KW.23.1.35. SpectreCodename for Phantom III Air Silencer. We have tried out the original Air Silencer as fitted to the SpectreCodename for Phantom III and find that it is not as effective as we should like for curing induction roar. Whilst the car is in the fitting shop therefore we would like you to arrange for 2 Bentley air silencers to be fitted, one on the top of each rocker cover, and an elbow and pipe coupling up 2 carburetters to each silencer, somewhat similar to the present Bentley arrangement (sketch attached). This scheme is purely an experiment and only needs to be in the form of an experimental "mock up". Hs{Lord Ernest Hives - Chair}/G.H.Whyman, | ||