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 comparing the performance of Aluminium and Cast Iron cylinder heads for a Bentley unit, measuring B.M.E.P against R.P.M.
| Identifier | ExFiles\Box 86\1\ scan0059 | |
| Date | 19th March 1934 | |
| B.V.25 CYLINDER HEAD COMPARISON (BENTLEY) UNIT: B.4A. ① ALUMINIUM CYLINDER HEAD (IGNITION SET FOR MAX. POWER) ② ALUMINIUM CYLINDER HEAD (IGNITION SET TO AVOID DETONATION) ③ CAST IRON CYLINDER HEAD (IGNITION SET FOR MAX POWER) ④ CAST IRON CYLINDER HEAD (IGNITION SET TO AVOID DETONATION) COMPLETE AIR SILENCER & TEST BED EXHAUST SYSTEM. B.M.E.P (LB/□") R.P.M. 19.3.34 | ||