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).
Letter to a supplier discussing the performance of a petrol filter, comparing it to a competitor, and enquiring about a custom-made version.
| Identifier | ExFiles\Box 44\1\ Scan107 | |
| Date | 18th February 1927 | |
| XUo=7 Exptl: Dept: Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}3/LG. 18th. Feb. 1927. Messrs. The Auto Klean Strainers Ltd., 1a, New London Street, London E.C.3. Dear Sirs, We have tested one of your P-S type petrol filters. The only real quarrel we have with this is that the spaces between the plates are too large. We find that these are anything up to .017". If we allow particles of this size to pass the filter, we get choked jets. The Zenith petrol filter which is one with which we are making comparative tests, has gaps of .0015" between its plates, and we find that this is more what we require. We consider the automatic cleaning of your filter works very well. It is obvious that if the selectiveness of the filter is increased, its capacity will also have to be increased. We consider that the capacity of the Zenith filter is too small. We should like to know whether you could make up a filter of the type that we have outlined. At the present moment we are not doing anything with oil filters. Yours faithfully, | ||