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).
The results of testing a hot spot throttle and induction pipe system for collecting liquid petrol.
| Identifier | ExFiles\Box 50\3\ Scan172 | |
| Date | 30th August 1921 | |
| OY. from Hs.{Lord Ernest Hives - Chair} Y4305 HS{Lord Ernest Hives - Chair}5/LG30.8.21. HOT SPOT - INDUCTION PIPES. We are very pleased with the latest results we have obtained with the hot spot throttle and the Dorris scheme for collecting the liquid petrol. We think it is excellent. We have arranged our connections and reservoirs practically identical to what you describe in your letter of the 8th.inst. We fitted in the reservoirs glass gauge tubes so that we could see how much liquid drained into them and how quickly it was before it boiled away. We found that in starting up cold a considerable quantity drained into the reservoir, depending, of course, upon how cleverly the pilot jet was used. As soon as ever the engine had been raced up by hand control, the petrol boiled furiously in the reservoir and soon they were dry. After that we never, under any condition, collected any liquid petrol in the reservoir. There were times when there was fog vapour shown in the glass tubes which we imagine was a small quantity of liquid petrol being boiled off. We have run with as much as a mixture of 50% paraffin with the worst petrol we could procure. With that mixture we get no loading up after running for half-a-mile at 12 M.P.H. full throttle. We attach herewith distillation curves for the fuel we have used. We use 20% paraffin as our standard - if you plot this against your U.S.A. curves you will see the fuel we are using is worse. We have proved that the addition of weirs in the induction pipe does enable us to collect more liquid petrol. Sketch attached. Contd:- | ||