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 the Bensport Petrol Pump, detailing pressure restrictions caused by various carburetter float chamber parts.
| Identifier | ExFiles\Box 27a\2\ Scan202 | |
| Date | 11th July 1933 | |
| 11.7.33. BENSPORT PETROL PUMP. Restriction due to various parts of carburetter float chambers - 2 off. S.U. The following pressures were recorded at the pump end of delivery pipe, using the full suction system, and a branched 5/16" diameter delivery pipe, the various details of the float chambers being added gradually. All the readings were taken at 2000 P.R.P.M. Carburetter Details. Total Back Pressure. Lbs/sq.in. Increase in Press. due to added details Lbs/sq.in. -------------------------------------------- --------------------------------- --------------------------------------------------------- Open pipe - 5/16" branch. 13" head. 0.5 0 + Float Chamber Covers - Without Fittings. 0.6 0.1 + Filters. 0.6 0 + .095" Dia. Needle seats - Standard. 0.7 0.1 + Needles - In lowest possible position. 0.75 0.05 Float chambers complete - Floats sunk. 0.8 0.05 Float chambers complete - Floats free. 1.1 0.3 The attached graph shows the decrease in delivery due to the attachment of various float chamber details. ---------- | ||