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).
Air silencer and carburettor performance, detailing maximum speed and acceleration tests on car 19-EX.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan146 | |
| Date | 22th November 1930 | |
| -4- Hs{Lord Ernest Hives - Chair}/ALL.1/BL.22.11.30.Contd. If the two outer tubes are taken off and replaced by an air maze ( in this case the air valve relief holes are deleted on account of noise), we regain .4 M.P.H. at the expense of a slight increase in noise. Actually from an air cleaner point of view we are of the opinion that this air silencer is more efficient; the air maze would appear to be more liable to be clogged up with oily dust etc. and is difficult to clean; as the air maze becomes clogged up the power loss increases. In the case of the tubular silencer the dust etc. will drop to the bottom of the silencer and can readily be cleaned out. Maximum speed tests were also carried out on a second car, 19-EX. In this case the drop in maximum speed was less. It was also shown that by fitting a louvred bonnet the consequent drop in air intake temperature was sufficient to cause an increase in speed equivalent to the loss due to fitting the air silenced carburettor. CAR 19-EX. CONDITION OF TEST. LAP SPEED M.P.H. Standard Carburetter - plain bonnet. 80.3 Air Silenced Carburetter - plain bonnet. 79.74 Air Silenced Carburetter - vertical louvred bonnet. 80.3 Acceleration Tests. Acceleration tests were carried out. These show that there is no measurable decrease in top gear when accelerating from 10 to 75 M.P.H. In third gear there is | ||