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 showing the effect of increased valve lift on engine B.HP and B.M.E.P.
| Identifier | ExFiles\Box 92\2\ scan0147 | |
| Date | 9th August 1931 guessed | |
| RM.{William Robotham - Chief Engineer} P.25 EFFECT OF INCREASED VALVE LIFT ON STANDARD CAMSHAFT AND CYL HEAD TWIN CHOKE CARB. 1 1/4" CHOKES. OPEN EXH. 4.78 C/R.{Sir Henry Royce} STD ALUM HEAD 1.9 VALVE THROAT VALVE LIFT .430 VALVE LIFT .480 .013 CLCE 68 IN 54 EX 51 B.H.P. 80 90 100 110 120 130 140 150 160 R.P.M. 500 1000 1500 2000 2500 3000 3500 INDUCTION DEPN INS. H.g. 0 1 2 3 4 B.M.E.P. LBS/SQ. IN 60 70 80 90 100 110 | ||