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 power and induction depression with different Weir induction pipes for a Phantom engine.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan122 | |
| Date | 20th April 1928 | |
| COMPARISON OF POWER & INDUCTION DEPRESSION, WITH WEIR INDUCTION PIPES. (PHANTOM). ENGINE N° HU.25. COMPRESSION RATIO = 4.55. STANDARD CARBURETTOR. STD. TWIN EXHAUST MANIFOLDS. NO HEAT TO HOT SPOT. CURVES:- ① WEIR IND.N PIPE (SCH. 965). ② INVERTED WEIR IND.N PIPE (L.E.C. 2511). ③ STD IND.N PIPE. BRAKE HORSE POWER. R.P.M. OF ENGINE. B.H.P. IND.N DEPRESSION. B.M.E.P. (LBS PER SQ. IN.) INDUCTION PIPE DEPRESSION (INS. MERCURY). V 314. | ||