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 power curves for a 500cc Rudge unit with different compression ratios.
| Identifier | ExFiles\Box 133\1\ scan0019 | |
| Date | 5th March 1936 | |
| 500 CC RUDGE UNIT FIG. IX POWER CURVES WITH DIFFERENT COMPRESSION RATIOS BORE 3.346 STROKE 3.464 CR{Mr Cra???ster / Mr Chichester} 7.3:1 8:1 VALVE TIMING (TAPPET CLCE .020) I.O. 4° E E.O. 50° E I.C. 50° L E.C. 7° L B.M.E.P. (LB / IN²) B.H.P. SPEC. FUEL CONS. (PT/BHP/HR) PISTON SPEEDS (FT / MIN) R.P.M. C.R = 8:1 C.R = 7.3:1 W.J.L. 5.3.36 | ||