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).
Carburetor testing and troubleshooting for a J.II engine unit.
| Identifier | ExFiles\Box 102\1\ scan0111 | |
| Date | 30th January 1933 | |
| X5080 File. 30.1.33. Report of work done on J.III. S.E. Carb. on J.II. engine unit. The carburetter was fitted to the engine using the existing J.II. induction pipe. An ideal metering curve was taken, the mixture being adjusted on mixture control for weakest with maintained power. The running below 1500 was irregular and the readings at these speeds did not seem reliable. The inclined passage to the base of the main jet standpipe was blocked up, and an actual metering curve taken under these conditions, the depressions at the base of standpipe and in floatchamber being also measured. This curve together with ideal one is plotted on accompanying sheet. From inspection of the depressions, it is evident that the level does not fall at all in the standpipe below static position, (i.e. no reversal of flow), neither does petrol flow over top of standpipe. The passage was then un-blocked and it was proposed to take an actual metering curve under these conditions, but running was so irregular at about 1250 RPM. and below that this was impossible. This irregularity is attributed to very bad distribution and this was checked by refitting the induction pipe and twin R.R. carburetters formerly on the engine and running at 1000, 1250, and 1600 RPM. - the running was regular and satisfactory, with only very slight uneveness at 1000 RPM. A new induction pipe for the S.E. carburetter is in the process of manufacture, and when this is obtained it is proposed to attempt to cure this distribution trouble - until this is done it is impossible to do anything with the metering of the carburetter. Hs{Lord Ernest Hives - Chair}/C.S.Steadman. | ||