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 discussing the performance and testing of a Cuno Auto-Klean oil filter, with an analysis of residue collected.
| Identifier | ExFiles\Box 44\1\ Scan305 | |
| Date | 30th April 1929 | |
| OY 3 April 30th, 1929. Mr. A.{Mr Adams} F.{Mr Friese} Sidgreaves, Rolls Royce Limited, London, England. cc - Mr. Bailey Mr. Hives Dear Mr. Sidgreaves: OIL FILTER - SECTION 5200 Thank you for your letter Sg{Arthur F. Sidgreaves - MD}6 of April 19th with enclosure from Mr. Bailey. We now have approximately 157,000 miles total experience on the Cuno Auto-Klean disc filter mounted not as a bypass but as a direct dirt-trap on the line between oil pump and - Main Bearings Extra Cylinder Lubrication Timing Gear Oil Supply. We believe it to be definitely superior to cloth filters used on a bypass line. The discs in the American instrument are of brass, with sheet brass separators giving a .002" gap between discs. There are 100 discs in the pack. The filter is cleaned by turning a handle on top of the filter every time oil is put in the engine. This rotates the plates between a pack of stationary scraper shims. On the last test of 5000 miles on a car at the works, we collected 100 cc of a black gummy mass of colloidal carbon having a specific gravity of .900. On two more filters used on the engine "running in" rig for approx. 1600 miles each, we collected the following solid residue - Filter No. 1 Filter No. 2 Carbon etc. .98 grams 2.245 grams (Burnt off.) Iron .57 grams .576 grams Aluminum .11 grams .292 grams Copper .31 grams a trace Sand etc. .17 grams .1355 grams Also 72cc of water due to leaking gasket. -continued- | ||