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 showing the effect of varying inlet valve size on engine performance for a Bentley unit with a complete air silencer fitted.
| Identifier | ExFiles\Box 3\6\ 06-page293 | |
| Date | 22th February 1935 | |
| EFFECT OF VARYING INLET VALVE SIZE (BENTLEY) UNIT. B.4 COMPLETE AIR SILENCER FITTED. ALL OTHER CONDITIONS AS FOR CURVES SHOWN ON BV 53. ① 1.500 DIA. INLET VALVES ② 1.450 DIA. INLET VALVES. B.H.P. R.P.M. B.M.E.P. (lb/sq.in.) 22/2/35 | ||