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).
Analysis of fuelizer performance and potential developments in induction pipe design.
| Identifier | ExFiles\Box 75\2\ scan0247 | |
| Date | 8th August 1921 guessed | |
| Oy2 - G 8821 Sheet #5. the fuel drops without heating the mass of the gas appreciably. Furthermore, above half throttle the device naturally dies out from lack of suction vacuum to maintain the fuelizer flame. At low speeds idling, however, when the amount of gas flowing is small and the vacuum high, the inlet gas is said to reach temperatures above 400°F.{Mr Friese} The idling of the Packard in all weathers is very good, but it loads up after low speed pulling, probably because under these conditions the fuelizer does not work. Any device which only works under conditions of high vacuum misses the great point of induction pipe heating; namely, improving the running under low speed full throttle conditions. The fuelizer must go out immediately one opens the throttle wide for acceleration. (d) Following naturally from the scheme of catching the fuel in hot corrugations, comes Dorris' scheme of pushing the fuel out of the pipe altogether and heating it somewhere else. He undoubtedly developed his scheme from observing the effect of bottles on loading up through keeping the pipe clear of fuel, as we have been doing. (4) Possible Developments: Personally I have always considered that Dorris' scheme was trying to make the best of a bad pipe. But Caswell, ever since he tried the bottles with the L.H. carburetter, has been getting more and more enthused about the scheme, and now points out that it could be readily adapted to the standard pipe. From experiments to date it really looks as though such a scheme might be the best of all we have in mind, because it does not depend on the time factor but starts to separate out the liquid from the moment the engine is started, and later boils it off at leisure when the engine has had time to warm up. We are therefore going to try a standard pipe without 1" through pipe and drains and heater as below: | ||