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 comparison graph of different Weir induction pipes on a Phantom engine.
| Identifier | ExFiles\Box 66a\2\ scan0191 | |
| Date | 25th April 1928 guessed | |
| V 314. COMPARISON OF POWER & INDUCTION DEPRESSION, WITH WEIR INDUCTION PIPES. (PHANTOM). ENGINE N⁰ AU.25. COMPRESSION RATIO = 4.55. STANDARD CARBURETTOR. STD. TWIN EXHAUST MANIFOLDS NO HEAT TO HOT SPOT. CURVES:- ① WEIR INDN. PIPE (SCH 965). ② INVERTED WEIR INDN. PIPE (LEC. 2511) ③ STD. INDN. PIPE. B.H.P. INDN. DEPRESSION B.M.E.P. BRAKE HORSE POWER. R.P.M. OF ENGINE. B.M.E.P. (LBS PER SQ. IN.) INDUCTION PIPE DEPRESSION (INS. MERCURY). | ||