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 high and low lift rockers using a single carburettor Japan unit.
| Identifier | ExFiles\Box 102\5\ scan0092 | |
| Date | 5th October 1931 guessed | |
| RM{William Robotham - Chief Engineer} 40 COMPARISON OF HIGH & LOW LIFT ROCKERS WITH SINGLE CARB. JAPAN UNIT INLET VALVE DIA 1.4 C/R 5.13/1 OPEN EX. 112° CAMSHAFT E 55640 CLCE (MIN) OF .225 MACHINED ROUND INLET VALVE VALVE LIFT .344 VALVE LIFT .395 CHOKE DIA. 38 M.M. DIFFUSER DIA. .625 FREE AREA PAST CHOKE 1.46 □" B.H.P. R.P.M B.M.E.P. INS. Hg INDUCTION DEPN. Ex. IN 32 10.6 46 46.4 .013 CLCE | ||