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).
The performance of a new type of Bijur pump.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan195 | |
| Date | 19th April 1929 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Gy. c.c. to Sz. Wor.{Arthur Wormald - General Works Manager} c.c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c.c. to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Gy3/LG19.4.29. ORIGINAL REPORT ON BIJUR PUMP. N.SCH.2830 X3806 X.7950 The new type Bijur pump according to fig.1. N.sch.2830 and using a spring controlled valve, is a great improvement on N.sch.2736 and N.sch.2647. The valve set to open .125 seems to pass thick Bijur oil as readily as thin Motorine C., and is even better than Bijur's own pump in this respect. The pump, which is designed to pass 18.75 cc's per shot, actually does this regularly. Possibly the pedal does not stall so quickly after touching the dashboard when the pump is nearly empty, but this is noticeable on the Bijur foot pump also. The reason for this would seem to be that there is not enough oil inside the thin mesh filter to fill up the capacity while the pedal is depressed, and in that time the oil in the container cannot pass through quickly enough to fill up the cylinder. This is not a serious fault, however, and in our opinion does not justify any alteration to the design. The pump now empties after 36 depressions of the pedal. We contemplate advising the owner to look into his tank every 3 weeks, and to replenish always before the pump is empty. It will be remarked that when the tank runs dry, air alone will be forced into the system. We do not anticipate that an owner will continue to operate the pedal afterwards without recognising this fact as the pedal comes contd:- | ||