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 comparing BHP and BMEP against RPM for different engine compression ratios.
| Identifier | ExFiles\Box 43\1\ Scan104 | |
| Date | 28th August 1925 guessed | |
| B.H.P. B.M.E.P. R.P.M. G F E CURVE No VI COMPRESSION RATIO COMPARISON CURVES E.{Mr Elliott - Chief Engineer} COMPRESSION RATIO 5.27/1 F.{Mr Friese} " " 6.09/1 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} " " " 6.28/1 EAGLE IX CAMSHAFTS INLET VALVE TIMING I.O. T.D.C. 14° I.C. 54° EAGLE IX CARBS. CORRECT FOR BAR. & TEMP. | ||