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 showing BHP and BMEP for an engine with large versus small valves in a turbulent head.
| Identifier | ExFiles\Box 179b\2\ img188 | |
| Date | 29th November 1932 | |
| COMPARISON LARGE V SMALL VALVES TURBULENT HEAD C/R 6.28-1 107 CAMSHAFT E.100863 HEAD E.100871 1 5/8 S.U. CARB OPEN EX. PISTONS E.100525 FLEXIBLE TYPE DYNO COUPLED DIRECT TO FLYWHEEL — 1.200 DIA VALVE - - - 1.125" " L.c.c. 3222 EX IN 8 5 35 42 .020 B.H.P. B.M.E.P. LBS / □" R.P.M. RM{William Robotham - Chief Engineer}* PR 36 | ||