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 of a Supercharged Peregrine engine, testing small versus large inlet valves.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page212 | |
| Date | 8th August 1932 guessed | |
| RM{William Robotham - Chief Engineer} PR 20 SMALL V LARGE INLET VALVES. SUPERCHARGED PEREGRINE. OPEN EXHAUST POWER: PLUS 1850 CC BLOWER NATURALLY AS RATED C/R 5.85 1 7/8 THROTTLE DIA S.U INLET VALVE THROAT 1.2" DIA AREA/LITRE 2.69 □" 1.125 2.34 □" Valve Timing Diagram: TDC 11 IN .020 CLCE EX 40 Axes Labels: B.H.P B.M.E.P LBS/D" BOOST PRESS INS HG | ||