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 comparing different camshafts on the 'Japan' engine configuration, plotting B.HP and B.M.E.P. against R.P.M.
| Identifier | ExFiles\Box 102\5\ scan0045 | |
| Date | 21th May 1930 | |
| CAMSHAFT COMPARISONS ON "JAPAN" TWIN ZENITH CARBS - 26 M/M CHOKES. SMALL INDN PIPE (1.25 INT. DIA) 5.25/1 COMPN RATIO. OPEN EXHAUST. V868. B.H.P. (CORRECTED FOR T & PRESS) B.M.E.P. lbs/sq" R.P.M. 112° CAMSHAFT 116° CAMSHAFT 110° CAMSHAFT VALVE BOUNCE HERE B.H.P. B.M.E.P. 112° CAMSHAFT LONG DURN 116° CAMSHAFT LONG DURN 110° CAMSHAFT SHORT DURN (AS USED ON STD "CHINA") acp 21-5-30 | ||