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).
Laboratory test results for a single petrol delivery unit under various conditions.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan021 | |
| Date | 13th July 1926 | |
| Contd. -2- EFCl/T13.7.26. We have made laboratory tests of the single unit with two different suction heads of 46" and 22" respectively of petrol. For each suction head we have taken the head-delivery characteristic with three different operating voltages, namely, 9, 12 & 15 volts, and the six curves so obtained are given on the attached photostat sheet of curves. The delivery was controlled by allowing the petrol to rise in a stand-pipe to a measured level. Measurement of the delivery wass made with a graduated vessel. Previous to taking the curves, we had run the instrument continuously under varying conditions in the daytime for three days (about 24 hours in all) with no suggestion of failure, except that on one occasion with a head of about 54", it ceased stroking and did not resume until the head had fallen to about 9". This, however, was under steady conditions and not when subject to vibration as it would be on a car. From the tests taken it would appear to be quite worth while investigating the operation of this instrument on an experimental car, also that one single unit would be sufficient for our big car. The time average current consumption varies between the limits 1/4 to 1/2 ampere, according to circumstances, a consumption which is not of serious consequence. There is of course the question of the noise of the instrument, but it remains to be seen whether this is | ||