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).
Graph showing the effect of increased valve lift on the Japan engine's performance, comparing standard and increased lift.
| Identifier | ExFiles\Box 92\2\ scan0137 | |
| Date | 18th September 1931 guessed | |
| CURVE III EFFECT OF INCREASED VALVE LIFT ON JAPAN ENGINE. 5.35 C/R TWIN ZENITH 26 M/M CHOKE. P II SHORT TYPE SILENCER 2" DOWNTAKE. 112° CAMSHAFT. ALL TESTS C.O. CLOSED. B.H.P. B.M.E.P. R.P.M. TIMING .020" TAPPET CL'CE Ex IN 5 7 43 43 ------ INCREASED VALVE LIFT .395 ______ STD. VALVE LIFT .344 INCREASE IN PEAK POWER DUE TO HIGHER LIFT 6 1/4 % | ||