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 maximum power output of B.60 and B.III engines under open exhaust conditions with different camshafts.
| Identifier | ExFiles\Box 123\5\ scan0201 | |
| Date | 1st December 1938 guessed | |
| OPEN EXHAUST COMPARISON OF B.60 AND B.III (MAX POWER) 1: B III 6.5:1 COMP 2: B 60 6.9:1 COMP (ORIGINAL CAMSHAFT) (EB 4026) 3: " (NEW ") (EB 4332) B.H.P. M.E.P. ① ② ③ | ||