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).
Design of a single-cylinder test unit, focusing on its variable valve gear mechanism.
| Identifier | ExFiles\Box 43\3\ Scan212 | |
| Date | 19th November 1928 | |
| LR.{Mr Ellor} from E.{Mr Elliott - Chief Engineer} c. to BJ. RG.{Mr Rowledge} c. to HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} X9003 E1/M19.11.28. X.3866 X.4003 RE. SINGLE CYL: TEST UNIT. Thank you for your memo. Lr{Mr Ellor}1/LG17.11.28. and print of RAE. present type variable valve gear. Regarding the particulars of the later RAE. scheme this is curiously like the one we have been working on since your visit to Ww. We now have separate overhead inlet and exhaust camshafts with direct attack on each pair of valves. These shafts are driven by worm gear from a vertical shaft, the same worm driving both camshaft worm wheels. Variation of timing is to be effected by moving the worm gears on moving splined driving sleeves. It is considered, but not yet decided, that the camshafts might be moved endways for changing cams. The vertical drive is arranged to accommodate changes in compression ratio. E.{Mr Elliott - Chief Engineer} | ||