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).
Blueprint graph showing B.HP vs R.P.M. performance and specifications for the 'Japan Unit' engine.
| Identifier | Morton\M13.2\ img103 | |
| Date | 18th September 1931 guessed | |
| JAPAN UNIT. RM.{William Robotham - Chief Engineer} 29. COMP RATIO 5.35-1 HIGH LIFT ROCKERS .395" INLET VALVES 1/4" DIA. THROAT. 112° CAMSHAFT OPEN EXHAUST CLAUDEL CARBS 26 M.M. CHOKES. TIMING .013 CLCE. IN EX 55 40 4.6 2 B.H.P. R.P.M. INDUCTION DEPN INS HG | ||