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 chart for different carburettor arrangements on a Japan Unit engine.
| Identifier | ExFiles\Box 102\5\ scan0078 | |
| 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. B.M.E.P. INDUCTION PIPE DEPN. INS HG R.P.M. EX IN 46 20 55 40 .013 CLCE. | ||