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).
Comparison of 'AC' and 'General' type oil filters, including a performance test on chassis 32-EX.
Identifier | ExFiles\Box 135\3\ scan0180 | |
Date | 16th November 1937 | |
16th. November 1937. OIL FILTERS. With regard to the oil cleaning ability there is little to choose between the "AC" and the "General" type of filters both being good in recovering the oil from a black sludgy state to their original amber colour. The "General" filter has the advantage regarding renewal of the element when dirty, it being only necessary to unscrew a finger screw to remove the lid{A. J. Lidsey} and the element can be lifted out by the loop provided. Renewal of the "AC" means the complete throwing away of the filter necessitating removal of the clips and uncoupling the pipes. Although we have no available figures we would say that a new element for the "General" would be appreciably cheaper than a complete new filter in the case of the "AC". The finger screw and bridge piece of the latest "General filter" is a big improvement over the original scheme whereby the lid{A. J. Lidsey} was pressed down by hand against a spring and then turned into locking slots. The new arrangement however, does seem rather bulky for the job it has to do. On the last 15,000 miles test on 32-EX a "General" filter was incorporated and though the oil was kept in a reasonably clean condition, the crankpins were as full of sludge (10 ozs.) as the previous 15,000 miles run with the standard type of fine mesh gauze filter. | ||