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 curve chart comparing a standard and a long duration camshaft for a Phantom engine.
| Identifier | ExFiles\Box 31\2\ Scan126 | |
| Date | 29th August 1933 guessed | |
| B.H.P. PHANTOM COMPARISON OF CAMSHAFTS E 82448 (STANDARD) & Hs{Lord Ernest Hives - Chair} 962 (LONG DURATION) TIMING FOR EACH:- I.O 2° B.T.D.C. TWO 1 7/8" S.U. CARBS. CURVE (14) E 82448 CAMSHAFT STANDARD SHORT DURATION INLET DURATION 230° Hs{Lord Ernest Hives - Chair} 962 CAMSHAFT LONG DURATION INLET DURATION 242° BMEP LBS/D" R P M | ||