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).
Power comparison graph for Engine 149.N.G.8, testing different carburettor and camshaft configurations.
| Identifier | ExFiles\Box 5a\5\ 05-page144 | |
| Date | 18th October 1938 guessed | |
| 'JAPAN' POWER COMPARISON V1149 AXIS LABELS: B.H.P. R.P.M. B.M.E.P. LBS. PER SQ. INCH (B.M.E.P.) [IND. M.E.P. AT 85% M.I.] CURVE LABELS: TWO CLAUDEL-HOBSON CARBS. 120° LONG DURATION CAMSHAFT TWIN-CHOKE ZENITH CARB. 112° LONG DURATION CAMSHAFT TWIN-CHOKE ZENITH CARB. 120° LONG DURATION CAMSHAFT TWO CLAUDEL-HOBSON CARBS. 112° LONG DURATION CAMSHAFT ENGINE 149.N.G.8 5.25:1 COMPRESSION RATIO ALL CURVES OPEN EXHAUST VALVE TIMINGS BOX: VALVE TIMINGS (120° CAMSHAFT) 120° LONG DURATION CAMSHAFT I.O. 12.5° B.T.D.C. E.O. 46.5° B.B.D.C. I.C. 52.5° A.B.D.C. E.C. 6.5° A.T.D.C. 112° LONG DURATION CAMSHAFT I.O. 7.5° A.T.D.C. E.O. 45.5° B.B.D.C. I.C. 40° A.B.D.C. E.C. 4.5° A.T.D.C. | ||