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).
Valve lift diagrams and proposing modifications to improve engine performance.
| Identifier | ExFiles\Box 33\4\ Scan065 | |
| Date | 21th February 1916 | |
| COPY. To E.{Mr Elliott - Chief Engineer} from R.{Sir Henry Royce} Copies to J.{Mr Johnson W.M.} Na.{Mr Nadin} Wor.{Arthur Wormald - General Works Manager} for EH. X/1770 R5/B21216. February 21st. 1916. Re Valve Lift Diagrams. Thank you for your excellent investigations of the valve areas. It seems manifest to me that the engine is limited through the resistance of the gas passing the valve. It appears that in the near future we shall have to adopt a twin valve arrangement, or at least larger sized valves, and the only thing we can do with the present ones is, as I telegraphed this morning, to make a camshaft having quicker acceleration by the cam, and about the same deceleration by the spring, and arrange it so that the lift is higher, in which case you will see that there will be more load on the rockers and rollers, but the valves would work with the same spring. I do not know at present, at what speed the valves leave the cams. R.{Sir Henry Royce} | ||