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).
The effects of using a heavy air valve on carburetter performance and idling.
| Identifier | ExFiles\Box 102\1\ scan0072 | |
| Date | 29th February 1932 guessed | |
| -2- (b) With heavy air valve:- The carburation in this case is essentially similar to when the light air valve is employed and has the same defect of excessive richness idling. When changing over from the light to the heavy air valve it is necessary to weaken off the low speed jet the equivalent of 10 notches on the quadrant in order to obtain the optimum setting. The high speed jet is not altered. In its present form this carburetter offers no advantages over the standard one. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} | ||