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).
Design and necessity of petrol filters for carburettors on aero and other engines.
| Identifier | ExFiles\Box 135\2\ scan0054 | |
| Date | 10th August 1924 | |
| To RG.{Mr Rowledge} from R.{Sir Henry Royce} c. to BJ. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} Y3701 R4/M8.10.24. PETROL FILTERS ON AERO AND OTHER ENGINES. X.4160 X.3701. X.4599 I do not agree with doing away with the petrol filters on the carburetters. Originally these were put in to deal with the scale and dirt which comes away from the interior of the petrol pipe etc. between the tank and the carburetter. If there is nothing to stop then the filter will not get blocked up and will do no harm. As a matter of fact it is our experience that fuel containing benzol, such as are normally used for aero engine work are especially bad for detaching scale and other materials likely to cause trouble. We do not intend doing away with the final filter on the car, situated near the carburetter. The great point is that these small float chamber filters should be fitted with suitable coarse gauze about 30 per inch. Just sufficiently fine to prevent choked petrol jet is all that is required. We are following a similar principle in dealing with the oil circulation, that is to say, using a coarse gauze filter of moderate dimensions for protecting the oil pump from large particles which might cause damage to the pump, and not attempting to filter the oil itself. The filtering of the petrol will be performed by a large filter made of fine gauze situated at the fuel tank. If there is any doubt about the wisdom of this practice, find out what Claudels and Zenith do. R.{Sir Henry Royce} | ||