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).
Results of a vacuum pump test with low fuel levels.
| Identifier | ExFiles\Box 17\5\ Scan017 | |
| Date | 31th January 1929 | |
| To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} 'SS{S. Smith}' VACUUM PUMP. X7510 With further reference to the vacuum pump. We asked GWH.{George W. Hancock - Head Chateauroux} to carry out a test for us on the car in France to see what actually was happening when his tank was nearly empty and there was no petrol in the autovac. The results of this test are as follows :- "We have carried out a test today for Rh{R. Hollingworth}'s information : With 2 gallons of petrol in the rear tank it took 4 mins. 54 2/5 secs. to suck one pt. of petrol, with the starter motor turning the engine over at the rate of 68 revs./min. With 1 gallon of petrol in the rear tank we could get no suction. There elapses approximately 20 secs. between each period of delivery". Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||