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).
Graph of piston displacement for crank angle showing indicated volumetric efficiency for a 40/50 engine.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan113 | |
| Date | 4th April 1928 guessed | |
| 40-50 ENGINE. STANDARD EXH SYSTEM. CUT OUT CLOSED. PRESS. SCALE 1" = 6.2 lbs/□" CYL. NO. 6. R.P.M. 2000. MAX PRESS. AT END OF EXH STROKE = 7.13 lbs/□" INDICATED VOL. EFFCY = 88% Indicated Vol. Efficiency ATMOS LINE PISTON DISPLACEMENT FOR CRANK ANGLE | ||