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 analysis graph of various short-type exhaust system configurations against engine RPM.
| Identifier | ExFiles\Box 179\2\ img008 | |
| Date | 30th November 1931 | |
| ANALYSIS OF EXHAUST SYSTEM SHORT TYPE RM.{William Robotham - Chief Engineer} P.42 30/11/31 P II 448 114° CAMSHAFT TO E.82/1 4.65 C/R STD. CYL. HEAD 1.5" VALVE THROAT R.R. TWIN CARBS. 1.4" DIA. CHOKES. ① MANIFOLD ONLY ② " + FRONT EXP. BOX + intermediate pipe ③ COMPLETE SYSTEM LESS FISHTAIL ④ COMPLETE SYSTEM B.H.P. B.M.E.P. LBS/SQ. IN. R.P.M. Valve Timing Diagram Text: EX, IN, IOIC EOEC, 10, 15, 50, 55 | ||