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).
Summary of comparative car performance tests with a table of results and a list of further test variations.
| Identifier | ExFiles\Box 3\4\ 04-page356 | |
| Date | 23th August 1933 | |
| (2) | Car. | Cut-out closed. | Cut-out open. | Increase. | |---|---|---|---| | 2.S.IV. | 82.39 | 83.64 | 1.25 | | 3.S.IV. | 85.13 | 86.32 | 1.21 | Further comparative tests were carried out as follows but in no case was the lap speed affected. (1) Carburetter air silencer on and off. (2) Sparking plugs. KLG.744; KLG.734; LKS.6; Lodge X.339; Lodge X.335. (3) Venturi shaped induction pipe balance in and out. (4) Engine petrol filter pack in and out. (5) Ignition timing varied 5º either side of normal. (6) Carburetter mixture strength increased above normal. No mechanical troubles were experienced during the course of the tests. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} | ||