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).
Dimensions for the new XC3 carburetter needle for the 20/25 HP model to improve petrol consumption.
| Identifier | ExFiles\Box 102\1\ scan0368 | |
| Date | 6th August 1935 | |
| 4508 To By.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Slt. c. to Mx.{John H Maddocks - Chief Proving Officer} HS{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager}2/KW. 6.8.35. 20/25 HP. Carburetters. With the improved method of manufacturing carburetters in the works, having given us some form of consistency, we have been able to slightly weaken the mixture and improve the petrol consumption without in any way affecting the performance of the car by using a different tapered needle, and we should like you to instruct for this needle to go into production immediately. The needle goes by the name of XC3 and its dimensions are, in thous. of an inch, at intervals of .125", as follows :- 1 .099" 2 .099" 3 .099" 4 .093" 5 .0885" 6 .0855" 7 .084" 8 .0835" 9 .083" 10 .0825" 11 .082" 12 .0815" 13 .081" 14 .0805" This needle should replace XC2 needle. HS{Lord Ernest Hives - Chair}/G.H.Whyman. | ||