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 standard, 50% larger, and 100% larger chokes on a China O/C Unit.
| Identifier | ExFiles\Box 5a\5\ 05-page197 | |
| Date | 22th December 1931 | |
| R M 61 COMPARISON OF STANDARD, 50% LARGER AND 100% LARGER CHOKES. CHINA O/C UNIT. ALL TESTS C.O. OPEN 20 & 1/2. EXHAUST SYSTEM C/R 5.75. CAMSHAFT E 57177 110.5° EX IN .020 CLE'E 40.5° 44° CARB. AS ON 20 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} & S. 50% LARGER CHOKES & AIR VALVE 100% LARGER CHOKES B.H.P. B.M.E.P. INDUCTION DEPN. R.P.M. 22/12/31 | ||