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).
Issues with petrol filters, the source of debris in the fuel system, and recommendations for filter design.
| Identifier | ExFiles\Box 135\2\ scan0060 | |
| Date | 15th December 1924 | |
| (3701 Hm.{Capt. W. Hallam - Head Repairs} c. Hs.{Lord Ernest Hives - Chair} BY8/H.{Arthur M. Hanbury - Head Complaints} 15. 12. 24. PETROL FILTERS. Referring to Hm{Capt. W. Hallam - Head Repairs}3/W. 13.12.24. this issue has been discussed by R.{Sir Henry Royce} in one of his recent memos, in which he points out that the trouble with the carburetters is not due to the omission of the filter on the filler of the petrol tank, but is the result of small pieces of scale etc. crackingaway from the inside of the pipe and connections, probably due to the action of the petrol itself. He therefore suggested that we should fit a coarse gauze filter on the carburetter, the gauze to be approximately 30 mesh or possible a little less. We have put R's request into effect and therefore we anticipate that large pieces of scale which are the cause of the trouble, will not in future reach the jets. /if The object of the rather coarse gauze is to permit very fine thread-like particles passing through this filter and not choke it, as there is no head of petrol to force the petrol through the filter should choke up, R's opinion being that the very fine thread-like pieces which are found in the petrol are not the cause of the trouble, but small pieces of grit and scale are the actual offenders. The evidence from filters dismantled shows conclusively that there is a large amount of sand and grit and small particles of metal which accumulate from parts between the inside of the filter in the petrol tank and the float chamber of the carburetter. In my opinion, it is very desirable to try and enamel or otherwise paint the inside of all castings etc. which are used in the system between the filter and the jets, as by so doing we should be able to stick on to the walls the bits of grit and sand permanently. BY.{R.W. Bailey - Chief Engineer} | ||