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).
The increasing gap between the cam and fibre at higher engine speeds.
| Identifier | ExFiles\Box 52\3\ Scan318 | |
| Date | 19th December 1917 | |
| ESC4/AT19.12.17. Contd. ------------- gap between cam and fibre had become about .015" and at 1650 about .020". At about 1700 R.P.M. this had increased to about .035" with the result that the make was taking place late to the extent of about 15° which represents about one quarter of the whole period. EFG. | ||