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 increased valve lift on a 'Japan Engine'.
| Identifier | Morton\M13.2\ img076 | |
| Date | 11th August 1931 guessed | |
| CURVE III EFFECT OF INCREASED VALVE LIFT ON JAPAN ENGINE. 5.35 C/R TWIN ZENITH 26 M/M.{Mr Moon / Mr Moore} CHOKE. P II SHORT TYPE SILENCER 2" DOWNTAKE 112° CAMSHAFT ALL TESTS C.O. CLOSED. B.H.P. B.M.E.P. R.{Sir Henry Royce} P. M.{Mr Moon / Mr Moore} Valve Timing Diagram: Ex IN 5 7 43 43 TIMING .020" TAPPET CL'CE. ----- INCREASED VALVE LIFT .395 _____ STD. VALVE LIFT .344 INCREASE IN PEAK POWER DUE TO HIGHER LIFT 6 1/4%. | ||