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 power output for a CXII high-lift unit with varying manifold and exhaust configurations.
| Identifier | ExFiles\Box 179\2\ img043 | |
| Date | 4th December 1931 guessed | |
| RM{William Robotham - Chief Engineer} 33 UNIT FITTED TO 20 G I CHINA POWER OUTPUT CXII UNIT HIGH LIFT CAMSHAFT E 57177 (110 S°) 5.76 C/R.{Sir Henry Royce} ① CUT OUT OPEN INSIDE DIA ② SMALL MANIFOLD (1.6 DOWNTAKE) FRONT EXP. BOX. PII SILENCER 1.5" FISHTAIL ③ LARGE MANIFOLD (1.875 DOWNTAKE) 1.875 STRAIGHT THROUGH STD. CYL HEAD AND INLET VALVES Valve Timing Diagram: T.D.C EX 36 IN 46° .020 CLCE Exhaust/Manifold Diagram: LARGE MANIFOLD SMALL MANIFOLD 1.6 DOWNTAKE 1.875 PII SHORT TYPE SILENCER PII SHORT SILENCER Graph Labels: INDUCTION DEPN INS Hg Axes: COMPRESSION PRESSURE LBS/□" B.H.P. B.M.E.P. R.P.M. | ||