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).
Technical note on a modification to eliminate a mechanical tinkling noise from the Autovac system.
| Identifier | ExFiles\Box 40\4\ Scan093 | |
| Date | 13th June 1925 | |
| Autovac Noises. Apart from the suction noise of the autovac there is a mechanical tinkling noise which becomes apparent when the car is driven over uneven roads, or when a stationary car is rocked on its springs. This is caused by the autovac float spindle (S) rattling in the outlet pipe of the inner chamber (P), and can easily be overcome by fitting a guide (G) for the float spindle, in the bottom of the inner chamber. It is necessary for the hole in the guide to be large enough to allow the spindle to work up and down in it very freely. Diam of float spindle = .145" Diam of hole in guide should not be less than .150". The guide used was made out of a piece of thin sheet brass (.035" thick) and was soldered into the bottom. Plan of guide | ||