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).
Petrol distribution issues, methods for draining excess fuel, and observational tests on cylinders.
| Identifier | ExFiles\Box 50\3\ Scan160 | |
| Date | 18th August 1921 | |
| Contd. -3- Hs{Lord Ernest Hives - Chair}4/LG18.8.21. On the average Nos. 3 and 4 always obtained the most. We noticed one bad condition for collecting petrol and that was when the engine was started up cold, if it was started and then stopped, it appeared as long as there was vacuum in the induction pipe, the petrol was held in suspension. As soon as ever the engine stopped, a considerable amount of petrol poured by gravity into Nos. 3 and 4 cylinders. The liquid which we collect in the bottles is excessive of the engines' demands because of bad distribution. The fact of the liquid running into the bottles and not being burned in the engine does not make any difference to the power or the consumption, therefore, if we could only drain this liquid petrol back-into-the-engin and even waste it, it would be far better than taking it back into the engine. Dorris, in his paper, recommends draining this liquid back on to the hot spot and vapourizing it. We think it would be very difficult to deal with this fuel which has already been measured out to the engine and is on the engine side of the throttle. It would appear, the only way of draining the petrol out of the induction pipe whilst the engine is running would be to use a similar mechanism as is used on the vacuum feed. We have also made another test by fixing in the brass plugs over the valves, two large glass windows. In the place of the intermediate plug we have fixed an electric pealamp which has lighted up the interior of the cylinders. We have then run the engine with that cylinder short-circuited and have watched contd:- R H 2386.(10,000 Bks) H & S Ltd. L/20 R-11-20. 200 G | ||