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 graph comparing large versus small valves in a turbulent head engine.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page242 | |
| 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 " " LEC. 3222 EX IN 8 5 42 35 .020 B.H.P B.M.E.P LBS/SQ' R.P.M M.P.H RM{William Robotham - Chief Engineer} PR 36 29.11.32 | ||