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).
Tests on silencers and recommending a new exhaust heated jacket induction system for the Phantom II.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan080 | |
| Date | 30th January 1930 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/AJL. (Held up). c. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} c. to DA.{Bernard Day - Chassis Design} S. c. to RY. ORIGINAL Hs{Lord Ernest Hives - Chair}/AJL.1/WJ.30.1.30. x7910 x7070 PHANTOM II EXHAUST HEATED JACKET INDUCTION SYSTEM. We have tested the silencer to N.Sch.3004 for the above system with 30 holes .250" diam. in pipe and baffle. The silencer was very noisy when sitting in the rear of the car and also when standing away from the car. We then made up another silencer having 45 holes .125" in diam., in the pipe and baffle. This was quieter than the original one but still much too noisy. In view of the good results obtained with the experimental type of silencer and also because of the urgency of the matter we are proceeding with this type of silencer, as shewn on BSH.1208 and 1209, for production purposes. We are using a malleable iron feed pipe (E.30194) from the cylinder head to the heated jacket and the simple jacketed bend E.30010. We get very good results with this scheme. The chirping noise is eliminated by the use of the malleable iron feed pipe, and the silencer is quiet and allows sufficient difference in pressure from the main system to give a good flow through the jacketed bend. We have not yet tried the two alternative jacketed bends as we are satisfied with the results obtained with E.30010. We recommend that this system be adopted for standardisation on all Phantom II cars. | ||