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).
On petrol filter issues in the 20 HP car, and the decision to standardise on the Enots filter for its greater capacity.
| Identifier | ExFiles\Box 44\1\ Scan270 | |
| Date | 22th January 1929 | |
| Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} X4037 Hs{Lord Ernest Hives - Chair}/RnS/LG22.1.29. PETROL FILTERS. X4037 X3700 One reason for the trouble experienced with the filter on the 20 HP. is that the petrol we are getting on our 10,000 miles tests in France is exceedingly bad. The filter is put there to get choked up if the petrol is sufficiently bad, rather than the carburetter because it is easy to clean. We cannot understand your inference that the 40/50 filter did not get choked because it was reported no less than 5 times during the 10,000 miles test in France on 15-EX car. You will note that we have standardised the Enots petrol filter which gives us more than 50% greater capacity of straining surface. This was directly due to the frequency we found the Zenith filter had to be cleaned. It will be utilised on the production cars as soon as we can obtain supplies. He/Rn.{Mr Robinson} | ||