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).
Increased suction noise and whistling from the Phantom carburetter.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 108 | |
| Date | 24th January 1927 | |
| Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux}1/T24.1.27. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to BJ. WOR.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} RE PHANTOM CARBURETTER. 78080 We have noticed that the carburetters which have been fitted lately with the 18° throttle valve and modified spray chamber have an increased suction noise. This is noticeable when pulling at medium speeds with small throttle opening. We have found that the 18° throttle valve is responsible for 80% of the increased suction noise, the remaining 20% being due to the modified spray chamber. The suction noise is much harsher than usual. We have tried several experiments to reduce the amount of noise, but have not been successful. We also note that the throttle valve is more prone to whistling and it will be necessary to make sure that the corners of the valve are rounded off, also that the slot in spindle is to drawing size, otherwise there will be trouble with the above. Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||