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 valve overlap and timing positions for different camshaft designs.
| Identifier | ExFiles\Box 98\5\ scan0017 | |
| Date | 13th May 1938 guessed | |
| T.D.C. .055 .050 VALVE OVERLAP WITH CORRECT TIMING POSITIONS .045 .040 .035 .030 .025 .020 .015 VALVE LIFT INS. .010 .005 INLET OPENINGS EXHAUST CLOSINGS CRANK ANGLE ① BENTLEY (E.B. 1085) CAMSHAFT (CAM FORMS F.59272) TIMING .020 CLCE I.O 3° B.T.D.C. E.C. 8° P.T.D.C. I.C 52° P.B.D.C. E.O. 51° B.B.D.C. ② BENTLEY Ⅲ L.E.C. 5426 TIMING .030 CLCE. I.O. T.D.C. E.O. 43.5° B.B.D.C. I.C. 45° P.B.D.C. E.C. 1.5° P.T.D.C. ③ B Ⅲ PROPOSED CAMSHAFT TIMING .030 CLCE. I.O T.D.C. E.O 45° B.B.D.C. I.C 45° P.B.D.C. E.C. 5° P.T.D.C. | ||