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 detailing the cylinder head development for a 4 1/4 Litre Bentley engine.
| Identifier | ExFiles\Box 134\2\ scan0075 | |
| Date | 1st September 1936 guessed | |
| 4 1/4 LITRE BENTLEY CYLINDER HEAD DEVELOPMENT POWER BOX 1: C/R 6.5:1 EX 22594 IN. VALVE 1.700 EX. VALVE 1.350 IN PORT 1.625 VALVE TIMING A BOX 2: C/R 6.5:1 LEC 4123 IN. VALVE 1.750 EX. VALVE 1.500 IN PORT 1.625 VALVE TIMING B TIMING B: I.O. 2° BT{Capt. J. S. Burt - Engineer} I.C. 28° AB E.O. 51° BB E.C. 7° AT TIMING A: I.O. 3° BT{Capt. J. S. Burt - Engineer} I.C. 53° AB E.O. 52° EB E.C. 6° AT AMAL. CARB. STRAIGHT ON TO IN. PORTS 1 9/16" THROTTLE BORE NOTE: THESE CURVES WERE COMPILED IN THE FOLLOWING MANNER: ① FROM MAIN ENGINE RESULTS 3.500 BORE UNIT COMP. RATIO CORRECTED FROM 9:1 ② FROM SINGLE CYLINDER RESULTS 3.25 BORE UNIT COMP. RATIO CORRECTED FROM 6.17:1 B.H.P. OBTAINED FROM B.M.E.P. CORR. TO 3.500 BORE UNIT. .020 CLC .020 CLC G.T.S. AXES LABELS: B.H.P. B.M.E.P R.P.M. | ||