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 results for a Bentley petrol feed system on chassis 4.B.IV at Brooklands.
| Identifier | ExFiles\Box 3\6\ 06-page037 | |
| Date | 16th September 1933 | |
| XU1724 To Messrs. From RR/Ltd. C.S.R. Mr. R C.B.L. Mr. P C.S.R. Mr. AP. R.C. H.C. HM{Capt. W. Hallam - Head Repairs}/Ltd.1/CC.16.9.33. K785. BENTLEY - PETROL FEED. We have tested chassis 4.B.IV. on Brooklands fitted up with the petrol feed system which will be used on the first fifteen cars. This consists of two S.U. electric petrol pumps fitted up to Lot.3626; the piping used was .250" bore throughout, the petrol tap and the pipe of tap suitable for .1875" dia. bore petrol pipe. This system gives a petrol delivery at the carburetters of 120 pts/hr., measured with everything cold. The small petrol tap will be used only on the first fifteen cars, afterwards a larger tap will be incorporated which will increase the petrol delivery further. The tests on Brooklands were as follows. (1) Five consecutive laps at maximum speed without any stop or easing off. The lap speeds were 88.5 m.p.h., 88.87 m.p.h., 87 m.p.h., 88 m.p.h., 87 m.p.h. The cut out was open during this test. The oil temperature at the conclusion of the five lap test had risen to 103ºC, and the water temperature to 85ºC (A Chrysler type fan was fitted). Air temperature 21ºC. (2) Windscreen folded down - cut out open. Lap speed - 88.94 m.p.h. 1 mile - 92.31 m.p.h. (3) Windscreen erected - cut out open. Best lap speed - 87 m.p.h. 1 mile - 90 m.p.h. The petrol feed system gave no trouble at all during the tests; at no time was there the slightest indication of insufficient petrol. The day was not hot, air temp. 21ºC, so that the car was not working under the worst conditions in this respect. We are carrying out tests in which the petrol pumps will be heated up to a temperature representing the conditions which exist under the bonnet on the hottest day in order to determine the effect on the petrol pumps of extreme conditions of heat. It was not possible to form an opinion of the noise made by the pumps as the car is an open one and few noises are heard. They were not prominently noisy. HM{Capt. W. Hallam - Head Repairs}/Ltd. | ||