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).
Diagnosis of an engine problem, identified as pre-ignition potentially caused by over-heating or fuel mixture.
| Identifier | WestWitteringFiles\J\December1922\ Scan98 | |
| Date | 27th December 1922 guessed | |
| contd:- -3- They go in the same manner as the sample 20 HP. car which was sent to S.W. It is most difficult to explain the cause because the engines have been put through the most severe tests and given no trouble. The only explanation we can give is due to a pre-ignition which starts the charge at a critical point of the compression stroke. There may be several other conditions which assist to bring this about, such as over-heating or type of fuel or mixture. Hs.{Lord Ernest Hives - Chair} | ||