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 performance effect of varying inlet valve sizes on a Bentley engine.
| Identifier | ExFiles\Box 3\6\ 06-page292 | |
| Date | 1st June 1935 | |
| EFFECT OF VARYING INLET VALVE SIZE (BENTLEY) UNIT: B.4. HIGH COMPRESSION ALUMINIUM CYLINDER HEAD COMPRESSION RATIO = 7.39:1 EXHAUST VALVES 1.200 DIA AEROLITE "RACING" PISTONS NO AIR SILENCER ① 1.500 DIA. INLET VALVES ② 1.450 DIA. INLET VALVES B.H.P. B.M.E.P. (LB/SQ") R.P.M. VALVE TIMING (.020 CLEARANCE) TDC 4.6° EXH 50.0° INL 49.2° [Stamp in bottom right corner reads: R.R. Ld. C.L. 1.6.35] | ||