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 curves for a 20/25 HP engine with various tank carburetter configurations and timing diagram.
| Identifier | ExFiles\Box 102\1\ scan0106 | |
| Date | 14th December 1932 | |
| 20/25 H.P. UNIT C.S. TANK CARBURETTER E58553 R.M. 71 14-12-32 ① COMPLETE CARB. E58553 ② E.58370 REMOVED ③ AS ② WITH E.58391 & E.51173 REMOVED ④ STANDARD = O.I.S CARB. (COMPLETE) COMP. RATIO 5.75:1 CAMSHAFT E.S.77/108° CAM FORKS F.S.2.75 Carburetter Part Numbers: E.58391 E.58370 E.51173 Graph Axes: B.H.P. B.M.E.P. R.P.M. Timing Diagram: TDC BDC 17° 79° 40.5° 42.8° TAPPETS AT .020 G.F.S. | ||