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).
Reducing exhaust noise and vibrations for the 20 HP model.
| Identifier | ExFiles\Box 48\4\ Scan223 | |
| Date | 1st September 1924 | |
| R.R. 493 (40 H) (SL 45 12-7-23). J.H. D. {John DeLooze - Company Secretary} X4238 EXPERIMENTAL REPORT. COPIES TO: (RCJ) (BJ) WOR {Arthur Wormald - General Works Manager} By (E Da {Bernard Day - Chassis Design} ) (EP {G. Eric Platford - Chief Quality Engineer} ) PN {Mr Northey} -OK (RS {Sir Henry Royce's Secretary} ) Expl. No. 4238 REF. Hs {Lord Ernest Hives - Chair} 1/LG26. 9.24. OBJECT OF TEST. To reduce exhaust noise and vibrations on 20 HP. TESTER. T. M. {Mr Moon / Mr Moore} Warwick. CONDITIONS. Tests carried out on 7-G-11 and 6-G-11 on the road and dynamometer. SUMMARY OF TEST. The proposed alteration to exhaust pipe and method of holding silencer gives the following advantages :- 1. Eliminates vibration on exhaust pipe at low speeds. 2. Reduces other vibrations which can be felt on certain cars. 3. Prevents distortion of exhaust pipe. 4. Reduces boom of exhaust. We recommend a similar scheme should be considered for the 40/50 HP., if only to avoid the distortion due to expansion on the 40/50 HP. - this is nearly .500". Hs. {Lord Ernest Hives - Chair} | ||