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).
Test results and a proposal to adopt an air silenced carburettor as standard for Phantom II cars.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan147 | |
| Date | 22th October 1930 | |
| -3- Hs{Lord Ernest Hives - Chair}/A.L.1/T.L.22.10.30.Contd. no loss when accelerating from 10 to 30 M.P.H.; from 30 to 60 M.P.H. there is a loss of only .6 seconds. All results are the mean of three separate tests. The following additional tests were carried out on 20-EX. CONDITION OF TEST. LAP SPEED M.P.H. ------------------------------------------------------------------ Air Silencer to Lac. 2803. 76.18 ------------------------------------------------------------------ Air Silencer to Lac. 2803 with baffle replaced by "Air Maze". 75.72 ------------------------------------------------------------------ Air Silencer to Lac. 2803 with baffle replaced with T.R. gauze. 75.6 ------------------------------------------------------------------ The exhaust cut out gave an average increase of 3.25 M.P.H. in lap speed, when open. We propose to adopt the air silenced carburettor as standard for all Phantom ll cars. We are basing our statement that the air silencer is a more efficient cleaner than the air maze on experience gained on 16-EX, at Le Canadel last winter. This car was fitted with this silencer in its earliest form; the silencer was cleaned out several times during the season there and was also examined on its return to Derby. A great quantity of dust mixed with oil was removed from the silencer. Had an air maze been fitted this quantity of dirt would have seriously clogged it up and restricted the air intake flow; it would have been almost impossible to remove it by cleaning. The latest silencer has gauze fitted to the middle of the baffle tube which will | ||