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).
Graph comparing engine performance using high lift rockers with different valve lifts and carburettors.
| Identifier | ExFiles\Box 13\2\ 02-page139 | |
| Date | 9th August 1931 guessed | |
| COMPARISON OF HIGH LIFT ROCKERS RM.{William Robotham - Chief Engineer} P.20 SMALL VALVE HEAD 476 C/R INLET VALVE THROAT 1.680 114° CAMSHAFT E.82448 TIMING AS IN RM{William Robotham - Chief Engineer} P.19 --- VALVE LIFT .525 - - - VALVE LIFT .470 CLAUDEL CARB. R.R. TWIN CHOKE CARB 1 1/4 THROAT B.H.P R.P.M B.M.E.P LBS/SQ " INDUCTION DEPN. INS. HG. NO APPRECIABLE DIFFERENCE IN LOW SPEED M.E.P. WITH VALVE LIFT. | ||