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 the Phantom III engine, comparing Standard and Continental units.
| Identifier | ExFiles\Box 92\6\ scan0108 | |
| Date | 1st December 1938 | |
| PHANTOM III - POWER COMPARISON SP{Mr Spinney} 39. COMPARISON BETWEEN STD & CONTINENTAL UNIT UNITS WITH SAME WATER HEAT HOT SPOT (STD) CURVES WITH STD CARB. (STROMBERG) OPEN EXHAUST. STD 6 PORTS HEAD VALVES: INLET 1.450 DIA, EXHAUST 1.250 DIA 4 PORT HEAD VALVES: INLET 1.500 IN, EXHAUST 1.300 IN CURVE ① o----o: 4 PORT HEAD CURVE ② o----o: STD. 6 PORT HEAD 6:1 STD. COMP. RATIO TIMING .020 CL'CE. (STD. SHAFT) I.O. 7° P. T.D.C. E.O. 47° B.B.D.C. I.C. 42° P. B.D.C. E.C. 8° B.T.D.C. CURVE ③ x----x "CONTINENTAL" 4 PORT HEADS DETURBULATED 5.5:1 COMPRESSION RATIO CAMSHAFT WITH LONG TOES AUTO TAPPETS DELETED TIMING .020 CL'CE I.O. 1° B.T.D.C. E.O. 40° B.B.D.C I.C. 48° B.D.C. E.C. 6° B.T.D.C AXIS LABELS: Left Y-Axis: B.H.P Right Y-Axis: M.E.P LBS/SQ. IN. X-Axis: R.P.M. CURVE LABELS: M.E.P (LBS/SQ. IN.) B.H.P | ||