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 an engine codenamed 'Japan'.
| Identifier | ExFiles\Box 6\7\ 07-page095 | |
| Date | 11th February 1937 | |
| CAMSHAFT COMPARISONS ON 'JAPAN' TWIN ZENITH CARBS. 26TH CHOKES. SMALL INDN PIPE (1.25 INT. DIA) 5.25/1 COMP. RATIO OPEN EXHAUST. V868. B.H.P. (Corrected to 760 m/m & 15.5 C) R.P.M B.M.E.P. (lb/sq in) B.H.P. B.M.E.P. 112° CAMSHAFT 106° CAMSHAFT 110° CAMSHAFT VALVE BOUNCE BEGAN 112° CAMSHAFT CONT. EXHT. 106° CAMSHAFT CONT. EXHT. 110° CAMSHAFT (AS PER S.M. DRG. No. 51144) M/L / 11/2/37 | ||