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 performance tests of various Weir induction pipes, plotting BHP and BMEP against engine RPM.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan192 | |
| Date | 20th February 1928 guessed | |
| WEIR INDUCTION PIPES TESTS. SHEET IV. V255. ⑧ { INDUCTION PIPE & FISHTAIL (WITHOUT SERRATED NOZZLE) TO SCH. 980 (BUILT-UP PIPE), HOT SPOT PIPE TO V233. (CARB. IN STD. POSITION) ⑨ { INDN PIPE & FISHTAIL TO SCH. 980, NOZZLE TO V236 (LONG TAPER SECTION). EAGLE IX VERTICAL R.R.C.H. CARB. ③ STANDARD INDN PIPE BRAKE HORSE POWER. B.M.E.P. (LBS/SQ") R.P.M. OF ENGINE ③ ⑧ ⑨ B.H.P. ③ ⑧ ⑨ B.M.E.P. HED | ||