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 for a Graham Supercharger on a Bentley engine.
| Identifier | ExFiles\Box 140\1\ scan0111 | |
| Date | 12th December 1934 | |
| B.Y.62. GRAHAM SUPERCHARGER ON BENTLEY UNIT:- B.12. SPECIFICATION: R.H.C./C.P./E.P 12.12.34 COMPRESSION RATIO:- 6.64 : 1 WASHER REMOVED FROM ROTOR CASING ① GRAHAM CARBURRETTER, ORIGINAL LONG INTERMEDIATE PIPE, COLD WATER TO ROTOR CASING ② AS ① BUT WITH HOT WATER TO ROTOR CASING. ③ NON - SUPERCHARGED. B.H.P. R.P.M. B.M.E.P(LB/□") VALVE TIMING (-020 CLRCE) T.D.C 4.5° 4.5° EXH INL 49.5° 48.5° | ||