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 for a single carburettor Japan Unit.
| Identifier | Morton\M13.2\ img113 | |
| 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. INS. Hg. INDUCTION DEPN. Ex. IN 46.4 46 110 O13 CLCE 3.2 10.6 | ||