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).
Performance graph showing the effect of increasing valve lift on a 'China' engine.
| Identifier | ExFiles\Box 92\2\ scan0136 | |
| Date | 1st August 1931 guessed | |
| CURVE II EFFECT OF INCREASING VALVE LIFT ON CHINA ENGINE. ENGINE UNIT C.9 CHINA ACCURATE C/R 5.35-1 SINGLE S.V. 1 5/8" CARB. OPEN EXHAUST 110° SHAFT. INDUCTION PIPE DEPRESSION. INS/HG B.H.P. B.M.E.P. R.P.M. ------ STD. VALVE LIFT .344 ______ INCREASED VALVE LIFT .395 .020 TAPPET CL'CE Ex In 4 16 28 37 DIA. OF INLET VALVE THROAT 1.35" INCREASE IN PEAK POWER DUE TO HIGHER VALVE LIFT 6 1/2 % | ||