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 the performance of Bentley and 20/25 camshafts.
| Identifier | ExFiles\Box 7\4\ X 608 Carburetter-page03 | |
| Date | 3rd January 1935 guessed | |
| COMPARISON BENTLEY AND 20/25 CAMSHAFTS C.R. 6.5:1 (E.H. 66) PISTONS F.B. 1299 IN. VALVE .400 DIA EX. VALVE .300 DIA 2-1"5/8" S.U. CARBS ON 1500 PIPE A: BENTLEY CAMSHAFT BENTLEY INDUCTION SYSTEM B: 20/25 CAMSHAFT J.{Mr Johnson W.M.} 6.0:1 C/R C: 20/25 CAMSHAFT 20/25 INDUCTION 5/8 C.R B.H.P. R.P.M. B.M.E.P. INDUCTION DEPRESSION, "HG I.O T.C E.O. E.C. 36B 40A 40B 85A E.S.5.E.(13°) 45B 38.5A 46B J.T.S. F.S.56B(11.5°) | ||