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).
Testing and comparison of different fuel feed disc-filters.
| Identifier | ExFiles\Box 44\1\ Scan244 | |
| Date | 19th October 1928 | |
| OY3.R.10.19.28 x3700 October 19th, 1928. TO: Mr. Beaver Mr. Nadin Mr. Caswell cc - Mr. Hives - England Mr. Robotham " FROM: Mr. Olley +4037 RE FUEL FEED - SECTION 7140 We have been working for some time to find a good disc-filter for the fuel feed - testing the European Zenith, (now used by England), American Zenith, and two forms of the Cuno "Auto Klean" which is favorably reported on by England. We think that if this is installed, we should no longer fit any strainers in the gas tank, so avoiding danger of troublesome blockage in this inaccessible part and making some saving in cost. A.{Mr Adams} Cuno Suction Filter. Of the filters tried the best appears to be the Cuno suction filter mounted on the fuel inlet banjo of the vacuum tank. Its advantages are :- (1) It cleans the fuel before it enters the vacuum tank so preventing trouble from dirt in the mechanism of the vacuum feed or in the needle valve of the reserve tank. (2) The fuel level stands normally in the glass bowl level with the bottom of the pack of discs and 1" below the joint face, so preventing leakage of fuel. (3) There is no drilling or other changes to parts of the car. It calls only for one extra banjo-plug and one extra joint in the fuel line. The disadvantage is that the filter must slow down the fuel feed to the vacuum tank, but so far this effect does not seem appreciable. We are verifying this shortly. We should like to know whether England has tested this type. B. Cuno Gravity Filter. This air locks persistently and starves the feed especially when starting on the pilot jet. Even when care is taken to avoid loops in the fuel line this occurs. -continued- | ||