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 top cup pumping with two vertical bell units in different positions.
| Identifier | ExFiles\Box 44\3\ Scan087 | |
| Date | 11th December 1928 | |
| TOP CUP PUMPING TESTS. Tests on Tank F.79192 (K.S.162) Continued. 2 vertical bell units fitted, i.e. (A) In centre of tank against near side baffle. (B) In normal position. 10/12/28. Approx. in tank. Mileage. Gauge. (A) (B) Night driving - 12.5 84 0 0 94 1 2 Wet Roads. 11.4 04 (20) 3.5 4.5 17 5 9 Overnight 11/12/28. 17 3.5 7.5 Very slow speed. 10.3 27 (40) 8.5 8.5 Carburetter 37 8.5 8.0 trouble through 9.2 47 (60) 8.0 7.5 dirt. 57 (80) 7.5 7.25 Wet roads. 8.1 69 7 7 8.0 Tank not emptied. Test continued; air lines uncoupled, as follows:- Wet roads. 8.0 69 0 0 Towcester 74 5.5 5.0 to 6.9 79 6.0 5.5 89 (20) 6.0 5.0 Derby. 5.8 99 (40) 6.0 5.0 19 5.5 5.0 4.7 29 (60) 4.75 4.5 4.2 38 (70) 4.0 4.0 Tank emptied 4.75 gallons. Approximate estimated contents of tank were slightly out, owing to these tests being a continued series on one fill up. Conclusion. That position "B" (normal) gives adequate top cup pumping, but that position "A" gives better pumping at other levels. If "B" were moved sideways in tank, until up against baffle, and all other dimensions retained the same, then the installation should be very satisfactory as a replacement or alteration from standard. | ||