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 graphs showing BHP and MEP vs RPM, detailing the effect of increasing clearance around the inlet valve.
| Identifier | WestWitteringFiles\W\September1931-November1931\ Scan032 | |
| Date | 6th October 1931 guessed | |
| EFFECT OF INCREASING CLEARANCE ROUND INLET VALVE JAPAN OPEN EXHAUST 112º CAMSHAFT E.55640 .344 VALVE LIFT 2 CLAUDELS 26 M/M CHOKES RAMMING PIPES COMPRESSION RATIO 5.35 Top Graph: VALVE LIFT .344 MIN. CLEARANCE ROUND INLET VALVE .005" Circle Diagram: 4.6º, 2º, IN, EX, 40, 55, .013 CLCE Bottom Graph: MIN. CLEARANCE ROUND INLET VALVE .100" AS ABOVE BUT .395 VALVE LIFT SEE SKETCH Axes: B.H.P. (60, 70, 80, 90) M.E.P. LBS/SQ." (100, 110, 120) R.P.M. (500, 1000, 1500, 2000, 2500, 3000, 3500, 4000) References: R.M. 46 M.E.P. 405/10 | ||