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).
Experiments to increase the power output of the 'China' engine.
| Identifier | ExFiles\Box 5a\5\ 05-page211 | |
| Date | 29th October 1929 | |
| COPY. X5771. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. Sr. c. Sgr. E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/ACL5/AD29.10.29. X.5771. X.6900. X5770. "CHINA" ENGINE - EXPERIMENTS TO INCREASE THE POWER OUTPUT. We have just completed the first part of a series of tests which we are carrying out on the large bore 20 HP. for the purpose of determining the best way of increasing the power output. The tests, from which we hope to give an analysis of the power contributed by various factors, are not yet completed, but our first results are interesting and shew considerable promise. A previous power curve supplied comparing the small bore with the large bore engine shewed an appreciable decrease in B.M.E.P. with the latter engine at speeds above 1900 R.P.M. The induction pipe depressions also increased. This led us to suspect restriction at the carburetter and valves. During previous experiments on the old small bore 20 HP. we shewed that the various modifications when used separately had only a small effect, but the effect was multiplied when used in conjunction with other modifications. For example a longer duration camshaft shewed little benefit unless used with low induction pipe depression and larger valves. Consequently we carried out the following | ||