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 comparison graph of four different carburetter setups for a 'Japan Unit' engine, showing B.HP vs R.P.M.
| Identifier | Morton\M13.2\ img104 | |
| Date | 18th September 1931 | |
| R.M. 30 18/9/31 COMPARISON OF CARBURETTER ARRANGEMENTS JAPAN UNIT . 112° CAMSHAFT OPEN EXHAUST. C/R 5.35 VALVE LIFT .395 ① 2 CLAUDELS RAMMING PIPES ② 2 ZENITHS NON RAMMING PIPES 26 M/M CHOKES DOWNDRAUGHT ③ 2 S.U'S NON RAMMING PIPES ④ TWIN CHOKE ZENITH 26 M/M CHOKES. B.H.P. R.P.M. INDUCTION PIPE DEPN. Valve Timing Diagram: EX IN 46 20 40 55 .013 CLCE. | ||