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 on a Japan Unit engine.
| Identifier | ExFiles\Box 5a\5\ 05-page169 | |
| Date | 1st 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 55840 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. H₂O " INDUCTION DEPN. EX IN 46° 16° 32 TO C O/S CLCE | ||