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 for a Peregrine engine, testing small versus large valves.
| Identifier | ExFiles\Box 1\10\ B001_X106 TO X 110-page040 | |
| Date | 12th July 1932 guessed | |
| SMALL V LARGE VALVES PEREGRINE RM{William Robotham - Chief Engineer} PR 15 PLUG REACH .600 OPEN EXHAUST 1 5/8 THROTTLE S.U. 5.85 C/R.{Sir Henry Royce} ---- TWO EX. VALVES. THROAT DIA 1.125 AREA/LITRE 2.34 SQ IN - - - ORDINARY INLET VALVE. " " 1.200 AREA/LITRE 2.69 SQ IN Valve Timing Diagram: 9, 3, IN, EX, 1020 CLCE, 29, 37 CURVES RUN INLET TAPPET CLCE .004 EX .006 ANGLE BETWEEN CAMS 104° TWO INLET CAMS B. H.{Arthur M. Hanbury - Head Complaints} P. B. M.{Mr Moon / Mr Moore} E.{Mr Elliott - Chief Engineer} P. R.{Sir Henry Royce} P. M.{Mr Moon / Mr Moore} | ||