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).
Preparations for road and bench tests on three different cylinder heads to analyze engine detonation.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 44 | |
| Date | 1st December 1926 guessed | |
| contd :- -7- (4) No advantage is to be gained by the use of smaller valves than at present employed with regard to detonation, ignition advance or self ignition. In order to gain more information about the influence this type of head exerts on detonation, we are preparing for road test three heads - the standard cast iron, the original alum; and the alum. one with the larger deflecting surfaces - and arranging for each to have the same compression ratio of about 4.65 to 1. We shall also continue bench tests with the latter mentioned head and intend trying this type with one deflecting side removed. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey! | ||