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).
Adoption of a low lift cam over a high lift cam and the feasibility of modifying existing parts.
| Identifier | ExFiles\Box 72\1\ scan0232 | |
| Date | 15th December 1924 | |
| U. Sft.{Mr Swift} c. Hs.{Lord Ernest Hives - Chair} ----- X. 9090 ? BY19/H.{Arthur M. Hanbury - Head Complaints} 15.12.24. ------------------ The Experimental Dept. are very anxious to adopt the low lift cam in place of the high lift which was at first considered the most desirable. We have, of course, instructed the Works to go ahead on High Lift Cam to Drawing No.E.70275. The new piece number will be E.71994. There is a difference in the cam form and a difference in the angle between the inlet and exhaust, the latter angle being 110 instead of 118. I am inclined to think, however, that providing the cam has not been hardened, that it would be possible to produce the new low lift cam from one of the high lift camshafts providing the Experimental would accept the 118° between the two cams for the few camshafts to the low lift scheme. We think there will be a former in existence. Will you kindly let us know what the exact position is so that we can decide just what can be done. We would like to know what is the best angle, that is the nearest approach to the low lift cam drawing quoted above, so far as the angle between the inlet and exhaust cams is concerned, which can be produced from the roughed out condition in which the high lift camshafts are at the moment. MADE AT DERBY BY.{R.W. Bailey - Chief Engineer} [Signature] | ||