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).
Flooding test on a Phantom III Stromberg carburetter to assess petrol leakage.
| Identifier | ExFiles\Box 93\2\ scan0113 | |
| Date | 26th October 1935 | |
| Rm{William Robotham - Chief Engineer} x308 Sg.{Arthur F. Sidgreaves - MD} and Wor.{Arthur Wormald - General Works Manager} from E.{Mr Elliott - Chief Engineer} C. Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} Mr. E.2/HP.26.10.35. Phantom 3 Carburetters. We have had a special flooding test made of the Stromberg duplex downdraught carburetter with the floatchamber needle jammed full open, and an electric petrol pump coupled up maintaining full pressure such as normally occurs with the ignition switched on. This is an outside condition never likely to occur in practice, but we wanted to see how much petrol came out of the main jets compared with other leakages, with a view to determining whether a well and drainage valve in the induction pipe is necessary, and if so what capacity of drainage would be required. This test shows that the amount of petrol emitted from the main jets into the induction pipe is small compared with external leakages. There was a big leakage from the acceleration pump and the floatchamber lid{A. J. Lidsey} ventilator, but there was considerably more total leakage than came from these two, and after blanking them up we found a cascade was emitted from the floatchamber lid{A. J. Lidsey} joint. This joint is a very poor one on the Stromberg carburetter, and the provision for making it appears to be inadequate in the disposition and number of holding down screws. The leakage from the floatchamber ventilation would be taken care of by a suitable pipe as now provided on the Bentley. The accelerator pump is not so easy to deal with as this is coupled by external mechanical means to the throttle control. In our flooding investigations on the Bentley carburetters we found that the needle was only held partly off its seat by flooding dirt, and we, therefore, want this test repeated with the conditions modified accordingly. We should also like similar tests made of | ||