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).
Consumption tests for a 20/25 HP carburetter (19-G-IV) with parts machined to rich and weak limits.
| Identifier | ExFiles\Box 102\1\ scan0358 | |
| Date | 3rd July 1935 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation} c. to Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell} c. to Hs{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager} Hs{Lord Ernest Hives - Chair}/GR.{George Ratcliffe}21/KW.3.7.35. 20/25 HP. Carburetter (19-G-IV). Consumption tests carried out with the following parts machined at maximum and minimum limits. E.59787 Main Jet Sleeve E.59797 Jet Bush E.60080 Suction Piston Spindle Rich limits, marked 'R' Weak limits marked 'B'. E.59797 Jet Bush was reamed after pressing into main jet sleeve E.59787 for rich limits; but not reamed after pressing, for weak limits. Consumption with parts marked 'R' - 14.5 m.p.g./45 mph/71 miles " " " " 'B' - 15.35 " /45 mph/71 miles Both tests carried out with the same XC2 standard needle. Carburation with parts marked 'B' was hopeless at low speeds. This was corrected by fitting an XC3 needle, which gave a final consumption of 15.1 m.p.g./45 m.p.h./71 miles. This carburetter is now ready for 21-G-IV (France) fitted with parts marked 'B' and an XC3 needle. Hs{Lord Ernest Hives - Chair}/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Ratcliffe. | ||