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).
Report page discussing crankshaft performance, a comparison between Lorraine and 20 HP engines, and planned experiments.
| Identifier | ExFiles\Box 22\4\ Scan096 | |
| Date | 18th March 1927 guessed | |
| contd :- -10- (7) The 'master period' of the crankshaft occurs at a high speed - 3800 r.p.m. - which is well outside the working speed range. It seems probable that such factors as compression ratio, gas velocity, induction pipe depression and valve duration may explain the major part of the difference which exists between the Lorraine and the 20 HP. In view of this we are at the moment carrying out some experiments on the 20 HP, using a cylinder head with large diameter valves in conjunction with the Lorraine carburettors. We hope to be able to report the results of this very soon. Hs{Lord Ernest Hives - Chair}/A.{Mr Adams} C. Lovesey. | ||