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 showing power output for a 'Japan Unit' engine with specific modifications to cams, rockers, and valves.
| Identifier | ExFiles\Box 102\1\ scan0067 | |
| Date | 12th December 1931 | |
| RM.{William Robotham - Chief Engineer} 58 POWER OUTPUT WITH R.R. CARBS TO LEC. 2924 JAPAN UNIT. 112° SHAFT. INLET & EXHAUST CAMS TO E.55358 HIGH LIFT ROCKERS OPEN EXHAUST INLET VALVE DIA 1.4 MACHINED TO GIVE MIN CLCE .225 ROUND VALVE C/R.{Sir Henry Royce} 5.65-1 CHOKE DIA. .90" T.D.C. 12 Ex 59 .013 CLCE IN 50.7 B.H.P. R.P.M. B.M.E.P. INDUCTION DEPN INS HG. | ||