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 air consumption and volumetric efficiency for a 500CC Rudge unit, comparing Penthouse and Hemispherical configurations.
| Identifier | ExFiles\Box 133\1\ scan0015 | |
| Date | 4th March 1936 | |
| 500 CC RUDGE UNIT, FIG. VI, AIR CONSUMPTIONS AND VOLUMETRIC EFFICIENCY, BORE 3.346", STROKE 3.464", C.R 7.3, VALVE TIMING (TAPPET CLCE. .020"), I.O. 4° E, E.O. 50° E, I.C. 50° L, E.C. 7° L, VOLUMETRIC EFFY. %, B.M.E.P. (LB/IN²), PENTHOUSE, HEMISPHERICAL, B.H.P., SPEC. AIR CONS. (LB/BHP/MIN), PISTON SPEED (FT/MIN), R.P.M., T.L.E. / 4-3-36 | ||