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).
Blueprint graph comparing power losses in old and new exhaust systems.
| Identifier | ExFiles\Box 179b\2\ img149 | |
| Date | 4th October 1932 | |
| COMPARISON OF POWER LOSSES IN EX. SYSTEMS AS PER RM.{William Robotham - Chief Engineer} PR.{Percy H. Rose} 30 SKETCH HS{Lord Ernest Hives - Chair} 722 FREE SYSTEM E.100625 OTHER SYSTEM E.100464 IMPROVED HEAD E.100520 6.23 C/R INLET VALVE 1.125 THROAT TWO S.U. CARBS. LODGE SHORT REACH PLUGS Valve Timing Diagram: TDC 3 108 1/2 EX. -013 IN 40 39 FORMS E.100361/2 TDF REMOVED Axes: B.H.P. (Brake Horse Power) B.M.E.P. (Brake Mean Effective Pressure) R.P.M. (Revolutions Per Minute) Table: LOSS TO EXHAUST SYSTEM AT 4500 R.P.M OLD SYSTEM | NEW SYSTEM COMPLETE SYSTEM | 14.0 | 5.4 FISHTAIL REMOVED | 11.8 | 3.2 SILENCER REMOVED | 7.8 | 1.3 Legend: ① OPEN EXHAUST ② MANIFOLD & DOWNTAKE TO MAIN SILENCER ③ As ② SILENCER FITTED. ④ As ③ FISHTAIL FITTED. COMPLETE SYSTEM. ⑤ OLD SYSTEM Exp Box E.100464 NEW SYSTEM | ||