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 different air silencer configurations on engine power output for a Bentley.
| Identifier | ExFiles\Box 3\6\ 06-page294 | |
| Date | 24th May 1938 | |
| EFFECT OF AIR SILENCER ON POWER OUTPUT (BENTLEY) UNIT-B.4. HIGH COMPRESSION ALUMINIUM CYLINDER HEAD COMPRESSION RATIO = 7.39 : 1 EXHAUST VALVES 1.200 DIA. INLET VALVES 1.500 DIA. AEROLITE 'RACING' PISTONS. ① NO AIR SILENCER ② STANDARD AIR SILENCER BUT WITH LARGER DIA. (3.000) INTAKE BEND. ③ STANDARD AIR SILENCER WITH STANDARD INTAKE BEND. VALVE TIMING AS SHOWN ON CURVES B.V.53. B.H.P. B.M.E.P. (LB/SQ. IN) R.P.M. | ||