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 chart comparing the Brake Horsepower (BHP) of a CXI high-lift unit with three different manifold and exhaust setups.
| Identifier | ExFiles\Box 102\5\ scan0110 | |
| Date | 4th December 1931 guessed | |
| UNIT FITTED TO 20 G.N CHINA. RM{William Robotham - Chief Engineer} 53 POWER OUTPUT CXI UNIT HIGH LIFT CAMSHAFT E.57177 (110.5°) 5.76 C/R.{Sir Henry Royce} KEY: ① CUT OUT OPEN ② SMALL MANIFOLD (1.6 DOWNTAKE) FRONT EXP BOX PII SILENCER 1.5" FISHTAIL ③ LARGE MANIFOLD (1.875 DOWNTAKE) 1.875 STRAIGHT THROUGH " " VALVE TIMING DIAGRAM: TDC Ex. IN 0.20 CLCE 36 46.4 EXHAUST DIAGRAM: LARGE MANIFOLD SMALL MANIFOLD 1.6 DOWNTAKE 1.875 P II SHORT TYPE SILENCER P I SHORT SILENCER GRAPH AXES & LABELS: B.H.P COMPRESSION PRESSURE LBS/SQ" R.P.M B.M.E.P. INDUCTION DEPN INS. Hg INDUCTION DEPN INS Hg STD CYL HEAD AND INLET VALVES | ||