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).
Test report on petrol pipe sizes for a Standard Phantom engine, recommending the adoption of a larger pipe.
| Identifier | ExFiles\Box 40\4\ Scan255 | |
| Date | 13th June 1927 guessed | |
| contd :- -2- out to the same inside dia. as the 3/8" petrol pipe. The results obtained are attached. The tests were carried out under the following conditions :- Standard Phantom engine. Petrol lifted through 32" (represent 6 galls. of petrol in the rear tank on a level road.) Length of piping 119" (as on the std. car). Standard rear tank petrol filter attached to the end of the petrol pipe; the main supply filter being used. Throttle conditions as stated on the curves. The results shew a very considerable increase when the larger pipe is used at high induction pipe depressions up to 16 ins. Hg., after which the delivery is the same in each case. At low depressions the increase is only very slight. The effect of the large pipe is to decrease the restriction to petrol flow and so decrease the time taken to fill the autovac float chamber. At induction pipe depressions above 16" mercury some other factor restricts the supply of petrol as no advantage is gained by using the larger pipe. It is recommended that the larger pipe is adopted, the nipples and autovac elbow etc. being opened out to suit. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||